Timberline 20200 Adjustable 7/16 to 19/32-Inch Diameter x 7/16-Inch Cut Height x 3/32 to 9/32-Inch Shank 2-Flute Carbide Tipped Countersink Accepts drills from 3/32-Inch through 9/32-Inch (wood screw sizes 2 through 18) 7/16 to 19/32-Inch Cutting Diameter 7/16-Inch Cutting Height 45-Degree Angle 3/32 to 9/32-Inch Shank, 2 Flute