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 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.

Works as advertised, smooth clean countering

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!

This thing is SUCH a joy to use! Ive never used a countersink which produces such perfectly smooth, clean and precise results in wood and plastic, every time. Why didnt i buy one of these sooner?!

It works well

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.

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

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.

Great for softer metals and mild steel.

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!