This aluminum alloy hinged drill has a hexagon handle with an incisal bit and a long service life. Widely used in woodworking door and window hinges, it will be automatically removed from these 2 side holes. The hinge drills are Easy in structure, easy to operate and easy to install. Come with different specification of drill bot to meet your Needs. These articulated drill tools are made of aluminum alloy, which is strong and durable. The positioning precision is high, it will not move, and The chip will be automatically unloaded from the holes at both sides of the higher drill bit without jamming the drill bit. Article Type: Hinge Drill Bit Material: Aluminum alloy Specification: 5 / 64in; 7 / 64in; 9 / 64in; 9 / 64in; 11 / 64in; 5in; 13 / 64in; 1 / 4in ONE turn drill for each hinge drill Hole Size: 5 / 64in: Hole Diameter: About. 2mm / 0.1, Self-tapping Screw: About. 2 ~ 2.8mm / 0.1 ~ 0.1 7 / 64in: Hole Diameter: Approx. 2.8mm / 0.1, Self-tapping Screw: About. 3 ~ 3.5mm / 0.1 ~ 0.1 9 / 64in: Hole Diameter: Approx. 3.5mm / 0.1, Self-tapping Screws: About. 4 ~ 4.5mm / 0.2 ~ 0.2in 9 / 64in: Hole Diameter: Approx. 3.5mm / 0.1, Self-tapping Screws: About. 4 ~ 4.5mm / 0.2 ~ 0.2in 11 / 64in: Hole Diameter: Approx 4.5mm / 0.2in, Self-tapping Screw: About. 5 ~ 5.5mm / 0.2 ~ 0.2in 13 / 64in: Hole Diameter: Approx. 5.1mm / 0.2in, Self-tapping Screw: About. 5.6 ~ 6.1mm / 0.2 ~ 0.2in 1 / 4in: Hole Diameter: Approx.6.3mm / 0.2in, Self-tapping Screw: About. 6.8 ~ 7.3mm / 0.3 ~ 0.3in When opening the holes, please adjust it according to the hardness of the woods. If the wood is soft, tender, you can choose the smaller one. If the woods are difficult, you can choose the matching ones or the bigger ones. The wood fries will be automatically discharged from the holes at both sides of the drilling. , the design of the drill bit will not be stuck, and the perfect perforation effect. Note: This does not include other things, the color is based on the first picture and the other pictures only show the Effect Due to the differences between different monitors, the picture may not reflect the actual color of the item. Due to manual measurement. Please allow deviation. Thank you!