Description: 1. Material: alloy 2. Specifications: 6 mm / 8 mm / 10 mm / 12 mm 3. Features: the cross head opening is round and durable 4. Compatible equipment: bench drill / pistol drill / rechargeable hand drill 5. Uses: for openings in ceramic/glass/ceramic/granite 6. Note: 12V charging drill torque is too low, it is not recommended
