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

Best counter sink Ive used for counter sinking metal. Didnt think it would last this long but it has long since paid for itself. Would absolutely recommend and repurchase when the time comes. Superior quality. Scoops like ice cream!

Have been using KEO products for years. Had to hone the cutting edge a little when I got them but that was no big deal. Hope they last me as long as the last set, over 20 years. I’ve used them on all kinds of steel, including 416 stainless.

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.

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.

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.

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?!

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.

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.

The single flute design keeps it from hopping all over the place like multi-flute versions. This makes for an excellent finish with no chatter marks. Just buy it.