KEO Cutters KEO 53525 Cobalt Steel Single-End Countersink, Uncoated (Bright) Finish, 90 Degree Point Angle, Round Shank, 3/8" Shank Diameter, 1" Body Diameter

I have no idea how well this works but the image does not match the product I received.I've tried the fluted (Amazon's image) countersinks that seem to leave a much better finish whereas the more angular, straight (my product), countersinks leave a rougher finish and don't cut as smoothly.I'll update after I try this but until then..... did not get what I order and would not have ordered this.False advertising.

Excellent stable reamer are doing counter sinks and deburring pipe id for fabbing spacers, or making on the fly hydraulic ftgs

Nice

ok