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

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.

Not bad

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

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 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!

Great for softer metals and mild steel.

Works as advertised, smooth clean countering

This tool works great. It cut nice and clean on walnut. It is well made and looks the part. My only minor gripe is that the shavings always end up in the hole in the middle. After a few holes I have to use something to push them out.

I’m a woodworker and needed a countersink for a 1/2” screw head and none of my standard drill-bit countersink combo but were large enough for the 1/2” head. I had a more conventional countersink only bit but it left a lot of chatter on the surface of the cut that looked terrible. This bit was the ticket in hard maple, worked quickly and very smooth and easy to control. Highly recommended.

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!