Amana Tool 55295 Carbide Tipped Countersink w/Adjustable Low Friction Depth-Stop 1/2 D x 49 Deg x 1/4 SHK Includes Repl. Drill Bit 630-228 Go to amazon.com Related posts The 16 best countersink bit 1/2 FeatureCarbide Tipped DescriptionCarbide Tipped 82 Degree Countersink with Adjustable Free Spinning, Low Friction Depth-Stop and Quick Release Hex Shank