Features: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,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 time.Wide Applications: Suitable for furniture,kitchens,woodworking,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.Package Includes:8Pcs Self Center Hinge Drill Bits Specifications:Material: MetalSize: 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.