KEO 53512 Cobalt Steel Single-End Countersink, Uncoated (Bright) Finish, 82 Degree Point Angle, Round Shank, 5/16 Shank Diameter, 1/2 Body Diameter

Great for use on wood. I first drill the pilot hole to the finished size, then use this tool to create a countersink. It cuts the wood very quickly and smoothly. It leaves no chatter marks the way traditional wood countersinks often do.

I bought this to counter sink screws in a diy closet cabinet build, and I love this thing. I was skeptical of the design at first, but this thing works better than any other countersink I own. Even in situations where I use a different countersink, I give a light pass over the hole with this one to smooth it out or remove burrs. I will never again not own one of these.

I have been using the fluted countersink bits - they always left a hexagonal pattern in the countersink when I drilled them. This has been far better- perfectly round and smooth. In my few weeks of use with a cordless drill it’s been fantastic.

I bought the 10 dollar Irwin countersink. Hey its a cheap bit what can go wrong? Everything! The countersinks came out looking like a flower, ridges and valleys, horrible! Even clamped down with a drill press. Back to shopping for a better bit I found this, and it is like night and day. It repaired the horrible Irwin countersinks with ease and left shiny smooth round countersinks for my bolts to snug into. No idea how long it will last, but I will never go back to a finned countersink. the smooth base 1 hole types are where it is at. This countersink works great!

Works as advertised, smooth clean countering

I bought this to counter sink the holes I was drilling for threaded inserts. When I first opened it, I wasnt expecting much, but it did great against red oak. Would purchase again.

I have used this in plywood and hardwood (walnut) so far. It makes gorgeous, clean countersinks in pre-drilled holes. I literally said Wow out loud to nobody the first time I used it in plywood. I am never going back to those awful multi-fluted countersink bits that leave torn-up jagged edges!

This is a de-burring tool, not a countersink. Know what your selling please. Missed return window before realizing.

It makes a dang fine smooth tapered hole. Have several fanged countersinks in the box; all exhibit steps around the edges. This one, with the sharp circular hole, is a design achievement.