Diamond Countersink 1/2" X 1/4"-28; 130 deg., 1/8" integrated pilot; 40/50-diamond

Diamond Countersink 1/2 X 1/4"-28; 130 degree with 1/8" integrated pilot; 40/50 grit diamond. Ideal for use on carbon fiber, fiberglass, fiber reinforced plastics and other abrasive type materials