Features: brand new and high quality Easy to Use and Install: Woods of different hardness require different self-centering drills. You only need to use a hexagonal wrench to disassemble the screws and replace the drill bit with a new one. The perfect carpentry tool for woodworking, wooden doors, cabinets, for windows, etc. High Quality: Made of quality steel, it is high hardness, rust-proof, sturdy, durable, excellent drilling performance, can be used as a centering guide for the guide hole required by the hinge. Hinge Bit Set: Equipped with 8 kinds of color common hinge screws, sizes 5/64", 7/64", 2 x 9/64", 11/64", 13/64", 1/4", 5mm; 1 x hex wrench, 8 x spare drill bits (used to replace every 8 sizes of self-centering drill bits). Ingenious Design: Double-face design, quickly and automatically discharge sawdust from the holes on both sides, without blocking the drill, saving sawdust for time. Wide Applications: Suitable for furniture, kitchens, woodworking, for windows and doors, etc. It can be adjusted appropriately according to the hardness of the wood. If the wood is soft, you can choose a smaller one, and if the wood is hard, you can choose a corresponding or larger one. Specifications: Material: Metal Size: 5/64", 7/64", 2 x 9/64", 11/64", 13/64", 1/4", 5mm Net Weight: 220g Note: Please allow 1-2cm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 8Pcs Self Center Hinge Drill Bits