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Your cart is empty.Designed to cut clean holes in wood and plastic. Can also be used with stop collars. Counterbores for the flat under the heads of nails, spikes, and bolts. Allowing them to be sunk far enough beneath the surface to allow for a wood plug to be used to cover the head. Can be set at any point on a twist drill and held fast with two hex-socket set screws. Designed for clean cutting. Made of Carbon Steel and heat-treated for long tool life.
Jack C Grant
Reviewed in the United States on July 20, 2017
Wow, this is a super useful tool! I couldn't believe how hard it was to find a 'counter-bore' bit. Plenty of countersinks, but counter-bore is what I needed. And this delivered! I built sides for my trailer and used this counter bore on 138 holes in white oak. It still cuts just as beautiful as the first hole, after 138 counter-bores. In white oak. I ordered two, just because I wasn't sure if it would hold up. Well, now I have a brand new extra one for my next project. If you want to recess a nut and washer, with a flat surface, counter-bore is what you want. I have included a couple pics. I didn't originally plan to counter-bore, so I had fit the sides and pre-drilled for 5/16" carriage bolts. To index the counter-bore after holes had already been drilled, I bought a long 5/16" bolt with plenty of unthreaded shank, cut off the head and threads, ground the end to a taper, and used that instead of a drill bit. Put it in the drill press on a medium speed and every counter-bore was perfectly centered. Highly recommend this bit.
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