Feature: 1. Selected high‑quality aluminum alloy and iron materials, strong and durable, wear‑resistant. 2. High positioning accuracy, will not shift when drilling, easy operation. 3. The chips will automatic discharge from the hole on either side of the top of the drill, not stuck drill. 4. Mainly used for drilling door and window hinges, with simple structure. 5. Hinge hole puncher, with drill bits of different specifications, suitable for woodworking. Specification: Item Type: Hinge Drill Bit Material: Aluminium Alloy and Iron Size: 5/64in: hole diameter is about 2mm / 0.08in, use about 2.2-2.8mm/0.09-0.11in tapping screw 7/64in: hole diameter is about 2.8mm / 0.11in, use about 3-3.5mm/0.12-0.14in tapping screw 9/64in: hole diameter is about 3.5mm / 0.14in, use about 4-4.5mm/0.16-0.18in tapping screw x 2 11/64in: hole diameter is about 4.5mm / 0.18in, use about 5-5.5mm/0.2-0.22in tapping screw 13/64in: hole diameter is about 5.1mm / 0.20in, use about 5.6-6.1mm/0.22-0.24in tapping screw 1/4in: hole diameter is about 6.3mm / 0.25in, use about 6.8-7.3mm/0.27-0.29in tapping screw (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 discharged from the holes on both sides of the drill, will not jam the drill bit, perfect punching effect.) . Package List: 8 x Hinge Drill Bit1 x Hex Wrench Note: 1. Please allow 0‑1 inch error due to manual measurement. Thanks 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.