Diamond Countersink 1/2" X 1/4"-28; 100 deg., 3/16" integrated pilot; 40/50-diamond

Diamond Countersink 1/2" X 1/4"-28; 100 degree with 3/16" integrated pilot; 40/50 grit diamond. Ideal for use on carbon fiber, fiberglass, fiber reinforced plastics and other abrasive type materials