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

Perfect for putting slight chamfers on drilled holes. Cuts aluminum like butter, but also works on mild steel without much more effort.

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.

Works really really well, excellent design! Very smooth countersinks in wood. Worked a lot better then the previous countersink I had (purchased from a home improvement store).

Very solid bit. High quality.

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 really like the design of this product. My previous bevel cutter had multiple cutting faces which caused the cutter to chatter and make an uneven surface. This cutter does not chatter and the result is a smooth as silk surface.

No chatter, good finish, and correct chamfer angle for flathead screws.

Used this on holes in a maple butcher block tabletop before putting in threaded inserts. Worked great - nice and smooth results.