1. High quality and durable material: All aluminum alloy products, beautiful and durable. Distance from door end to infinite hinge position is 68mm. Suitable for hinges with 3mm, 4mm, 5mm and 6mm offset. 35mm reamed holes with small drill bit to locate the holes. 2. Easy to use: With limit ring to adjust the drilling depth. Equipped with universal clamps for stable and firm clamping. The drilling sleeve adopts precision bearing guide drilling sleeve, which makes drilling more stable and easy. 3. Adjustable drilling depth: Adjust the distance between the limit ring and the drilling sleeve to determine the drilling depth. This hidden hinge jig is suitable for wood boards with a thickness of 15mm to 25mm. With it, you don't have to worry about damaging the cabinet door anymore. 4. Integrated design: Built-in hinge locating holes for quick positioning of the screw holes, and the included limit frame can accurately locate the exact distance from the center of the hole to the edge of the wood. The integrated design makes the main body more solid and not easy to shake. 5. Outstanding woodworking tools: The upgraded hidden hinge jig kit has perfect drilling effect without leaving traces, complete tools, easy to disassemble and install, very convenient to use, it is a good tool for furniture factories and woodworking enthusiasts, as well as a small family helper, your good choice. Corkscrew size Approx. 35 mm/1.37 inches Drill bit:2 mm Colour:As Shown Material:aluminum alloy Package Contents: 1 * Hinge opener 1 * Hole saw 2 * Wrench 2 * Hex wrench 2 * Drill 1 * Spacer ring Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.