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

So far it works better that any other countersinks I own, should last a long time.

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.

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.

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.

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 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.

It works well

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!