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Your cart is empty.Use SD-3 Counterbores to drill a pilot hole and counterbore a flat bottomed hole in one step. Perfect for lag screws, lag bolts, washer head screws, T-nuts & more.
Dakota
Reviewed in the United States on March 1, 2025
I like the counterbore for cutting a flat bottom hole, so my bolts don't extend out. Makes a clean cut. The 1/4" hex shaft makes it easy for using in the drill or an impact driver.
Small Town Carpenter
Reviewed in the United States on January 7, 2025
I use this to counter bore and through drill serving tray handles in one shot. Works like a charm! Fast and easy drilling. Would buy again if anything happens to the one I have.
DM
Reviewed in the United States on June 9, 2024
I bought this bit for a deck project where I wanted the boards to be face-fastened, but hidden under matching wood plugs. This bit worked perfectly. It's razor sharp and makes an absolutely perfect counterbore. Do a practice run on a scrap piece first because if you drive too deep, you will gouge the face of your board, but once you get the hang of it, you'll know where to stop before going too far.
Greg
Reviewed in the United States on May 22, 2024
I bought these to put holes/counterbores in PVC based siding for our new house. The installers were originally drilling the holes, then coming back later and picking up every piece again and drilling the counterbores. This made it a one step process which more than doubled thier output. Great little product. I actually then bought some very inexpensive drills ($50 each) and put them on a table, put these bits in and drilled 3 holes at the same time and paid for the drills in about 4 hours. Just had to think differently. These items did there job and saved me a lot of money.
Chris
Reviewed in the United States on December 7, 2024
Countersink holes for mounting frames.
Peter Preston
Reviewed in Australia on August 27, 2023
As expected this item is exceptional in quality and performance,will be purchasing other sizes of these. Thank you. Also speedy delivery. :-)
David Peters
Reviewed in the United States on April 15, 2023
Pictued is a sample hole in a piece of maple. Both the cutters and drill do a great job. This was done in a drill press at 2500 rpm.Edit: also pictured is the corner block installation on a dining chair. This bit worked wonderfully well for this purpose.
Dennis Fox
Reviewed in the United States on December 18, 2022
This tool is sharp and cut nice counterbore holes in the Ikea particleboard I've been cutting. But this tool also did not come with any kind of tools too, so I needed to fabricate my own. I did like how the scraps cast nicely away from the cutting area, making this tool easy to use.
leisureguy
Reviewed in the United States on May 25, 2020
Makes perfect holes, with perfect recess, and made in USA. In the photo is a piece of hard maple that I drilled out for "crib" or "connector" bolts. I drilled the holes in the wood first, then I applied the stair tread tape, then I ran the drill bit IN REVERSE so it would not tear the tape. The tape does not have much of a shoulder, and I noticed it pulling when spinning in forward / clockwise motion. Holes came out so clean that it looks like factory work, and not something I completed in my kitchen.
Pierre Mertiny
Reviewed in Canada on November 10, 2019
Used the tool on plastic. Worked very well and created a clean cut.
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