7 DIFFERENT SIZES: The hinge drill bit comes with the 7 most common hinge screw sizes: 2 mm, 2.8 mm, 3.5 mm, 4.5mm, 5mm, 5.2mm, 6.35mm, ideal for drilling holes in small hinges for carpenters, cabinets, cabinetmakers and other joinery, or decorative box hardware. < p>HIGH QUALITY MATERIAL: High speed steel drill bit with a designed brass body; High hardness, rust resistance, strength, durability and superior drilling performance which serves as a guide for centering the pilot holes needed for hinges. PRECISE POSITIONING: Pilot hole bits are precisely positioned and do not shift. The drill guide can be fixed well to ensure punching accuracy. Sawdust automatically flows from the holes on both sides of the drill bit without jamming the drill. This increases the safety of using the product. EASY USE AND INSTALLATION: Wood of different hardness, requiring different centering drill, you just need to disassemble the screw and replace the drill with a new one. Perfect carpenter tool for woodworking, mounting hinges on wooden doors, cabinets, windows, etc. EXCELLENT DESIGN: The sawdust will be automatically drained from both sides of the holes, without blocking the drill, you will not have to remove wood chips, which will effectively increase your work.