General description High-speed steel (HSS) hinge drill bit set designed for precise and efficient drilling of hinge holes. This set includes four commonly used sizes: 5/64", 7/64", 9/64", and 11/64", making it ideal for woodworkers, carpenters, and furniture makers. The unique double-sided hole design allows for quick and automatic discharge of sawdust, enhancing the drilling experience and saving time. Technical specifications Material: High-speed steel (HSS) Sizes: 5/64" (hole diameter: ~2 mm), 7/64" (hole diameter: ~2.8 mm), 9/64" (hole diameter: ~3.5 mm), 11/64" (hole diameter: ~4.5 mm) Recommended screw sizes: 5/64" (2.2 - 2.8 mm), 7/64" (3 - 3.5 mm), 9/64" (4 - 4.5 mm), 11/64" (5 - 5.5 mm) Installation Easy to install with a unique design that ensures perfect punching effect. The bits can be quickly changed, allowing for one-handed loading and unlocking. Usage Suitable for installing door hinges on wooden doors, cabinets, and windows. The self-centering feature ensures accurate