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Description
Bosch 21 Piece Black Oxide HSS Jobber Length Twist Drill Bit Set with 135 Degree Split Point Tip and Three Flat Shank for Wood Plastic MetalPrecision Starts and Extended Life: The Ultimate General Purpose Drilling Solution for Professionals The Bosch 21 Piece Black Oxide Metal Drill Bit Set is meticulously engineered to meet the rigorous demands of contractors, electricians, and professional tradespeople. Featuring a premium black oxide coating, these High Speed Steel (HSS) bits are designed to significantly reduce friction and heat buildup, providing a longer service life than standard
Precision Starts and Extended Life: The Ultimate General-Purpose Drilling Solution for Professionals
The Bosch 21-Piece Black Oxide Metal Drill Bit Set is meticulously engineered to meet the rigorous demands of contractors, electricians, and professional tradespeople. Featuring a premium black oxide coating, these High-Speed Steel (HSS) bits are designed to significantly reduce friction and heat buildup, providing a longer service life than standard drill bits. Whether you are drilling through light-gauge metal, PVC, fiberglass, or hardwoods, the 135-degree split-point tip ensures a "no-skate" start, allowing for immediate penetration and clean, accurate holes without the need for a center punch.
Beyond superior cutting performance, this jobber length set prioritizes secure handling and ease of use. Bits sized 3/16-inch and larger feature a specialized three-flat shank design, which promotes a superior grip within the drill chuck to prevent slipping under high-torque applications. Each bit is equipped with high-visibility markings for rapid diameter identification, ensuring you spend less time searching and more time working. Housed in a durable case, this comprehensive assortment covers the most common drilling diameters, making it the perfect universal kit for general-purpose maintenance and construction projects.
Key Features
- 135-Degree Split-Point Tip: Engineered for clean, accurate starts that eliminate skating on hard surfaces.
- Black Oxide Coating: Specialized finish generates less friction and extends the overall life of the bit.
- Three-Flat Shank: Promotes a better grip and prevents bit slippage in the chuck on sizes 3/16" and larger.
- Universal Applications: Ideal for general-purpose drilling in wood, plastic, fiberglass, and light-gauge metal.
- High-Visibility Markings: Clearly marked diameters allow for fast and easy bit selection.
- Right-Handed Rotation: Standard right-hand twist geometry optimized for most drill drivers.
What's Included
- (2) 1/16 In., (2) 5/64 In., (1) 3/32 In., (1) 7/64 In.
- (2) 1/8 In., (1) 9/64 In., (1) 5/32 In., (1) 11/64 In.
- (2) 3/16 In., (1) 13/64 In., (1) 7/32 In., (1) 15/64 In.
- (2) 1/4 In., (1) 5/16 In., (1) 3/8 In., (1) 1/2 In.
- (1) Durable Storage Case
Specifications
| Material | Black Oxide Coated HSS |
| Bit Length | Jobber Length |
| Set Count | 21 Pieces |
| Tip Geometry | 135-Degree Split-Point |
| Shank Type | Three-Flat (3/16" and larger) |
| Max Drilling Depth | 3.0 Inches |
| Compatible Tools | Drill Drivers |
| Wood/PVC/Fiberglass Use | Yes |
| Metal Use | Yes (Light-Gauge Only) |
| Rotation | Right Handed |
Pro-Tip: When drilling through light-gauge metal, use a lower speed setting on your drill and apply a drop of cutting oil to the tip. This works in tandem with the friction-reducing black oxide coating to prevent overheating the bit and ensures the cleanest possible exit hole.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.8 ★★★★★
Based on 13 reviews
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Product Reviews
★★★★★ 5
Comfortable chair that works great for long hours
Color: Black
I’ve been using this office chair for a few days and it’s been very comfortable for working and longer desk sessions. The high back design and ergonomic support help maintain good posture, while the cushioning stays comfortable throughout the day. The chair feels sturdy and stable, and the 330 lb capacity gives it a solid, durable feel. It also rolls smoothly and quietly, which is nice when moving around the workspace without creating a lot of noise. Overall, it was easy to assemble, looks professional, and offers great value for the money.
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Reviewed in the United States on June 10, 2026
★★★★★ 5
Very Comfortable Ergonomic Chair - Great for Long Work Days!
Color: Black, Color: Black
I’ve been using this ergonomic office chair for a couple of weeks now and I’m genuinely impressed. For the price, it offers excellent comfort and support.
What I like:
• Very comfortable padded seat and backrest — I can sit for 8+ hours without back pain.
• Good lumbar support and adjustable height/armrests.
• Holds up to 330 lbs easily (I’m 240 lbs and it feels very stable).
• Smooth rolling wheels and sturdy base.
• Easy to assemble (took about 20 minutes).
The mesh back breathes well and doesn’t get hot. It looks professional in my home office too.
Overall, this is a solid ergonomic chair. If you spend a lot of time at a desk, I highly recommend it.
Would I buy it again? Yes, definitely.
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Reviewed in the United States on May 12, 2026
★★★★★ 4
Great if you're average height.
Color: Black
Comfortable for the price. The seat could be a bit better, but for a budget friendly ergonomic chair, it's well made and has helped a lot with my back pain caused by my previous desk chair.
Assembly wasn't terribly difficult, though I did have one screw with damaged threads. Luckily they ship spare screws in the kit, so that was a non-issue.
Rollers work great on my small rug and hard flooring and don't tend to tangle cords or cables too much.
Size wise, works great for my frame (5 ft 6 in) but for someone more than a few inches taller than myself, you should probably look at another chair.
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Reviewed in the United States on September 4, 2025
★★★★★ 5
Great chair
Color: Black
I am very happy with my purchase. Easy to assemble but be aware your drill bits included with your set won't fit their screws. However, you can get a fair bit done with the drill and then use tool included to adjust. Super comfortable and exactly the right height for my desk. Highly recommend for quality exceeding price point.
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Reviewed in the United States on May 9, 2026
★★★★★ 1
Review from an "actual" tall person who doesn't weigh 400 pounds.
Color: Black
I recommend this chair.
Firstly, I looked at least dozens of chairs and nearly every review in trying to select a chair. I didn't want to spend $200.
It's confusing because everyone's idea of perfect is of course subjective. One thing, What is tall? I'm 6'6" I think that's pretty tall. Others feel that 6'0" is tall. LOL In the listing, it shows this chair is good for a 6'5" person which I think is pretty accurate. I weigh about 210 pounds and the padding is just fine. One thing I would push manufacturers to do would be to give accurate measurements. Seat height low and high. Back support height. Head rest added to back height etc.! Maybe actual human measurements that the chair is geared toward. Nice to know that 400 lbs is cool but that doesn't tell me much.
My primary goal was to find a chair I could sleep in because I recently had a
back injury and sleeping on my bed, while fine, resulted in intense pain trying
to get up in the morning. We'll see what happens but the headrest reaches my head
which was goal one.
The lumbar fits so I don't need to use cushions and pads etc. I found the upper
position of the support to be right for me and it's super comfortable. Plus number
two.
The raised height of the chair fits my long legs (inseam 36") Plus three.
I wanted adjustable arm rests but this one doesn't have that. No biggie, for me the height of the arm rests is pretty much just right. It might be a little high for some.
The back leaning adjustment doesn't lock except for upright. Locking upright is good, and leaning back - for me - doesn't really need to lock.
Being an actual tall person made me really skeptical. I'm relieved that I won't have to take it apart to return it. The assembly was straight forward and pretty easy though I'd suggest not really tightening the arms snugly before getting the back squared away - the alignment is easier if you do that.
I got the chair for $109 with 21% off. It's slightly wobbly yet feels pretty well made. It rolls well enough.
I'm quite satisfied with the purchase and I'll come back if there are updates.
Edit one. I've had it a week now and found I couldn't sleep in it. I think it would be better if the back could recline separately from the seat. There might also be figuring out a way to support my legs due to the back and seat reclining together rather than separately. Two. I kind of wish more now that the arms were adjustable for height and tilt if that makes sense. I have a bar stool next to me on the right in front of my desk that is the right height to relax my right arm while reaching my mouse on the desk so that's my work around there. Three. The casters are kind of basic and don't roll as easily on the floor matt as my former second hand chair - they would probably be fine on a hard surface. I'll probably switch them out. Four: The lumbar support, while mostly in the right place is unpadded and creates kind of a hard spot there. I've re-introduced my lumbar support pillows for comfort there.
All in all, I'm still happy with the $100 purchase. In my experience, being pretty tall always comes with compromise and these notes are not deal breakers for me.
Yea, It can always be more perfect but unless you're in a showroom test driving and willing to spend $300? Right.
UPDATE: I'm really not satisfied with this chair and in fact, I wish I hadn't bought it. Firstly, the pneumatic post that the chair part connects with is wobbly depending on which way it is facing according to which way the legs are aligned. It's like a poor fit and I'm pretty mechanically inclined.
Second and also important. The lock to keep it upright and inclined only worked for a few weeks. For a while, you had to mess with it to engage the upright position. It no longer works.
Worse than that, the lumbar support pad disconnected with the chair and is now floating and after only a month or so, the remaining supports for the Lumbar rest have dug into the fabric on the back of the chair creating holes in the back's fabric. I've tried but there is no way to reconnect that bit without removing the back's fabric as far as I can see.
I'm taking this down to one star for sure. Poor design? Poor manufacturing? Yea. I wouldn't suggest this chair to anyone. If the company comes up with a solution, I'll continue my review.
As for now. Not a recommendation.
Update: Not impressed and kind of crappy. Mentioned is that the so called lumbar thingy disconnected and is unusable. I've got my own pad which seems to help. Also, it's wiggly where the chair connects to the base. Months later, I might toss it and go back to the chair I bought locally and second hand.
Don't buy this chair!
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Reviewed in the United States on March 20, 2025
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