General description This 2-piece 6.35 mm (1/4 inch) keyless drill bit features a hexagonal drill chuck and a quick-change adapter, making it ideal for converting impact drills and facilitating quick changes between tasks. Technical specifications Hex shank size: 6.35 mm (1/4 inch) Clamping range: 0.3 mm to 6.5 mm Material: Metal for maximum durability Usage Designed for use with electric impact drills and electric motors. Allows for quick changes between various twist drills. Other information Note: The product cannot be used counterclockwise.