MATERIAL: The hinge sight drill is made of high quality aluminum alloy material, which is strong and durable, wear resistant. High Quality Materials Can Bring You Good Experience SIMPLE OPERATION: These Door Hinge Drill Bits have high positioning accuracy, which will not move when drilling, and they are easy to use, you can use it easily and quickly FEATURES: Chips will automatically discharge from the hole on either side of the top of the drill, not the stuck drill. It is very convenient for you to use it WIDE APPLICATION: Self-centering hinge hole punch is mainly used for drilling door and window hinges, with simple structure. It is very suitable for woodworking DIFFERENT SPECIFICATIONS: The hinge hole drilling tool has drill bits of different specifications, which can meet your different working needs, and it is also yours to replace Specification: Item Type: Hinge Drill Bit Material: aluminum alloy Size: 5/64 ": hole diameter is about 2mm / 0.08", use about 2.2-2 tapping screw , 8mm / 0.09-0.11 " 7/64": Hole diameter is about 2.8mm / 0.11 ", use about 3-3.5 tapping screw mm / 0.12-0.14 " 9/64": hole diameter is approx 3.5mm / 0.14 ", use approx 4 4.5mm / 0 tapping screw , 16-0.18 "x 2 11/64": hole diameter is about 4.5mm / 0.18 ", use about 5-5.5mm / 0 tapping screw , 2-0.22 " 13/64": hole diameter is approx 5.1mm / 0.20 ", use approx 5.6-6.1mm / 0 tapping screw , 22-0.24 " 1/4": The hole diameter is about 6.3mm / 0.25 ", use a e Tapping screw approx. 6.8-7.3mm / 0.27-0.29 in. (When opening the hole, please adjust it according to the hardness of the wood. If the wood is soft, you can choose the smaller one. If the wood is hard, you can choose the corresponding or the larger one. The wood chips will be automatically unloaded from the holes on both sides of the drill, will not jam the drill bit, perfect punching effect.) Package list: 8 x hinged drill bit 1 x wrench hexagonal Note: 1. Please allow 0-1 inch error due to manual measurement. Thank you for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.