SKU: 89320537986

Bosch HBT387 3-7/8 Inch Bi-Metal Hole Saw M42 Cobalt Alloy 5 TPI Progressor Tooth for Wood Metal and Plastic

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Description

Bosch HBT387 3-7/8 Inch Bi-Metal Hole Saw M42 Cobalt Alloy 5 TPI Progressor Tooth for Wood Metal and PlasticDURABLE M42 COBALT PERFORMANCE FOR HEAVY DUTY CUTTING Achieve superior cutting results and extended tool life with the Bosch HBT387 3 7 8 Inch Bi Metal Hole Saw. Engineered for the demands of professional job sites, this hole saw is constructed from Boschs enhanced M42 alloy material, featuring 8% cobalt. This high grade composition provides excellent heat resistance, allowing the blade to withstand high temperatures and delivering up to 20% longer

DURABLE M42 COBALT PERFORMANCE FOR HEAVY-DUTY CUTTING

Achieve superior cutting results and extended tool life with the Bosch HBT387 3-7/8 Inch Bi-Metal Hole Saw. Engineered for the demands of professional job sites, this hole saw is constructed from Bosch’s enhanced M42 alloy material, featuring 8% cobalt. This high-grade composition provides excellent heat resistance, allowing the blade to withstand high temperatures and delivering up to 20% longer life compared to standard bi-metal saws. Whether you are drilling through tough metal, stainless steel, wood, or drywall, this tool ensures clean, precise cuts every time.

The HBT387 is designed for maximum efficiency and ease of use. It features the innovative "Progressor" tooth design with a 5 TPI configuration, which allows for faster cutting speeds and cleaner edges. The unique triangle "shark tooth" side slots effectively dissipate heat and solve the common frustration of stuck plugs, making debris removal quick and simple. With a reinforced shoulder for added strength against high torque and a deep cup to handle thick materials, this hole saw is a versatile and reliable addition to any toolkit.

Key Features

  • M42 Cobalt Alloy: Contains 8% cobalt for superior heat resistance and up to 20% longer life in tough materials.
  • Progressor Tooth Design: Alternating tooth sizes (5 TPI) ensure faster cutting and cleaner holes.
  • Triangle Slot Design: "Shark tooth" side slots allow for easy plug ejection and improved heat reduction.
  • Reinforced Shoulder: Adds structural strength to the base to prevent failure under heavy loads.
  • Deep Cup Capacity: 1-3/4 inch depth allows for drilling through thicker materials like 2x lumber and composite layers.
  • Multi-Material Versatility: Optimized for cutting wood, metal, plastic, drywall, and stainless steel.
  • Universal Compatibility: Works with standard mandrels and SpinLOCK universal arbors (sold separately).

What's Included

(1) 3-7/8 Inch Bi-Metal Hole Saw (Arbor/Mandrel Sold Separately)

Specifications

Manufacturer Bosch
Model Number HBT387
Saw Diameter 3-7/8 in.
Max Cutting Depth 1-3/4 in.
Teeth Per Inch (TPI) 5
Blade Material Bi-Metal M42 (8% Cobalt)
Tooth Design Progressor
Arbor Included No (Requires Large Mandrel)
Applications Wood, Metal, Plastic, Drywall
Side Slots Triangle (Shark Tooth)
Impact Rated No
Package Quantity 1

Pro-Tip: For the best results when cutting metal, operate your drill at a lower RPM and apply a cutting lubricant. This simple step significantly reduces friction, prevents the cobalt teeth from overheating, and ensures a smoother, cleaner cut while extending the life of the hole saw.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. 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
SKU: 89320537986

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FITZ-HUGH IRVING
Lowell, US
★★★★★ 5
Not your regular under eye patches
Im in love with these under eye patches. These are not your regular under eye patches. My eyes look refreshed and hydrated. I often keep them on all day and i love the tightening effect after they dry down. My under eye feels firmer and looks plumper. Sometimes i will even wear them overnight. They are very cooling. I love that they are clear so not very visible on zoom meetings. For all that it does, it is definitely worth the hype and the price.
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Reviewed in the United States on May 8, 2026
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Trina Dixon
Houston, US
★★★★★ 4
Provides cooling to tired eyes
These patches feel really good under your eyes. They are cooling, reduces puffiness, reduces discoloring and bags under the eyes. The only issue I have is not staying under the eye very well. Other than that they moisturize quite well and they are effective. The scent is very subtle so not to irritate your eyes. I use this line of products so I would definitely recommend
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Reviewed in the United States on May 21, 2026
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Brooke Ballinger
Alexandria, US
★★★★★ 5
Great for crows feet
I thought this was a cream it is actually patches. They adhere well and are great while sleeping. I noticed a reduction and wrinkles around my eyes after the first night. There was a generous supply of product on the patches and are worth the money.
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Reviewed in the United States on May 30, 2026
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TheFaceLadyG
Cuba, US
★★★★★ 5
One of My Favorite Multi-Use Patches — Great for Under Eyes and Smile Lines
At 52, post-menopausal, with dry, mature skin, I’m always looking for products that help with the areas that tend to show age first—especially the under-eyes and around the mouth. Those areas can lose firmness, show fine lines, and look more tired faster than the rest of the face. These patches have become one of my favorite targeted treatments. First, I love how easy they are to use. The patches are well saturated, comfortable on the skin, and stay in place nicely once applied. That alone matters because so many eye patches slide around and become more annoying than helpful. These feel secure and simple to wear while getting ready or relaxing. What I noticed most under the eyes was that the area looked more hydrated, smoother, and fresher after use. Puffiness looked reduced, fine dehydration lines were softened, and the skin had a more rested appearance. No, they are not going to permanently erase aging overnight, but they absolutely help the area look better. I also appreciate that they do more than just add temporary moisture. With regular use, the under-eye area looks better maintained and less tired overall. Another reason I love these is that I also use them on my smile lines / nasolabial area. That has been a great bonus. The curved shape works surprisingly well for placing around the mouth, and the extra hydration helps soften lines and improve the look of that area too. That multi-use flexibility makes the product much more valuable to me than standard eye patches. The formula feels cooling and refreshing, and I like using them before makeup or before going out when I want my skin to look a little smoother and more awake. I also appreciate the ingredient direction. Dr. Melaxin tends to focus on firmness, support, and mature-skin concerns rather than trendy fluff, and that’s one reason I keep coming back to the brand. Who I think these are great for: mature skin, dry under-eyes, puffiness, fine lines, smile lines, travel days, special-event prep, or anyone wanting targeted treatment patches. Who may want to skip them: people expecting permanent wrinkle removal, anyone who dislikes patch-style skincare, or those wanting the cheapest basic eye patch option. Value-wise, I think these are excellent because you can use them in more than one area and actually see a visible cosmetic benefit. I’ve used many patches over the years, and these are among the better ones.
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Reviewed in the United States on April 19, 2026
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Morgan Legg
Chelsea, US
★★★★★ 5
great product
my favorite i use every single night and i don’t wake up with puffy eyes anymore
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Reviewed in the United States on May 21, 2026

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