This drill bit has a hexagonal shank system and also works with all standard drill drivers. The Countersink Bit Hex-Shank performs smooth countersinking for screws and deburring of holes in soft materials. Work easily and steadily with seven 90-degree cutting edges. A high power-transfer due to the he -shank provides flush results, and the ground countersink made of tool steel with an optimum surface quality offers even work in wood and plastics.