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Description
Simpson Strong-Tie MDMX06221Q (5/8" x 21") SDS-max Shank Quad-Head Drill Bit for Concrete DrillingSimpson Strong Tie MDMX06221Q Description The SDS max Quad Head Drill Bit is designed for efficient drilling in concrete and masonry, featuring a durable carbide tip and advanced head geometry for enhanced performance. Simpson Strong Tie MDMX06221Q Includes (1) SDS max Quad Head Drill Bit Simpson Strong Tie MDMX06221Q Features Uniformly brazed carbide inserts for longer bit life Centering tip for easy spot drilling Chromium nickel molybdenum steel
Simpson Strong-Tie MDMX06221Q Description
The SDS-max Quad-Head Drill Bit is designed for efficient drilling in concrete and masonry, featuring a durable carbide tip and advanced head geometry for enhanced performance.
Simpson Strong-Tie MDMX06221Q Includes
- (1) SDS-max Quad-Head Drill Bit
Simpson Strong-Tie MDMX06221Q Features
- Uniformly brazed carbide inserts for longer bit life
- Centering tip for easy spot drilling
- Chromium-nickel-molybdenum steel alloy body for durability
- Heat-treated and shot-peened finish for increased hardness and reduced wear
- Conforms to ANSI Standard B212.15
- Chisel-shaped head for efficient material penetration
- Patented multi-flute spiral for improved drilling speed
- 4 x 90° head geometry for rebar penetration
Simpson Strong-Tie MDMX06221Q Applications
- Concrete drilling
- Masonry drilling
- Brick and block applications
Simpson Strong-Tie MDMX06221Q Specifications
| Diameter | 5/8 in. |
| Length | 21 in. |
| Drilling Depth | 15-1/2 in. |
| Head Type | Quad Head |
| Shank Style | SDS-max |
| Material | Hardened Steel |
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
4.2 ★★★★★
Based on 11 reviews
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Product Reviews
★★★★★ 5
Very solid and nice looking
Color: Natural, Size: 72 Inch
Very solid. Mounting hardware is sturdy when you mount it into the studs of the wall. I weigh 180 lbs and I sat on it with no issue
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Reviewed in the United States on December 30, 2025
★★★★★ 5
Bonus secret compartment in these beauties 😉
Absolutely LOVE these real wood shelves. The perfect depth to actually be functional in the bathroom! Came with all the hardware to install and very well packaged--you can tell a lot of care went into these. The hardware was tucked into a carved out notch on the backside of the shelf, which now we can use as a secret compartment! (Seriously, no one would find it there if you wanted to hide some keys or cash! 🤭) The metal drywall mounting brackets didn't work (or we just weren't using them correctly?), but we had other drywall mounts, so it wasn't a problem for us. Highly recommend these high quality shelves. 👍
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Reviewed in the United States on November 30, 2025
★★★★★ 1
Be aware, questionable quality
Color: Natural, Size: 36 Inch
Great idea, but overall a huge pain. Had to order and return multiple times to get a shelf that didn't have crumbling edges, jagged wood filler, or giant cracks.
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Reviewed in the United States on May 31, 2026
★★★★★ 5
Look fabulous….
Color: Natural, Size: 72 Inch, Color: Natural, Size: 72 Inch
Medium heavy shelf, Easy to install, looks great, perfect for this utility room. Less expensive than others, A++.
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Reviewed in the United States on January 6, 2026
★★★★★ 3
Metal Parts are Flimsy
Color: Natural, Size: 72 Inch
The wood shelf part is very nice, but the hardware is lacking for this length of shelf. The bracket that mounts to the wall is very thin metal, and mine was warped so that I had to bend it a bit to mount it straight. It also allows the shelf to bounce at the slightest touch, even though it is attached at the studs. I had to use a couple of chair brackets on the bottom of the shelf to keep it steady, which kind of defeats the "floating shelf" look. That said, with the brackets it is now quite sturdy and doesn't look bad at all.
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Reviewed in the United States on October 5, 2025