Durable Material: Made of high quality aluminum alloy, precision manufacturing, accurate positioning, convenient operation. The Concealed Hinge Jig allows you to drill cup holes for concealed cabinet door hinges, great for boring concealed hinges and door locks. Adjustable: The drill guide is adjustable to tension wooden boards of different thicknesses. It is a great tool kit for furniture factory and woodworking fans. 35mm hinge opening installation, door hinge punching positioning, woodworking hole opening auxiliary tool. Easy to Use: Install a 35mm hole opener, adjust the drilling depth to 12-13MM normally, and then lock the limit ring. Simple to use with any drill?no special tools needed. Application: Suitable for drill press, pistol drill, bench drill, vertical drilling machine, hand held electric drill, stand motor-driven drilling machine and mobile ribbon type magnetism drilling machine etc. FULL SET: 35mm Hinge Drilling Jig comes with a 35mm fastener bit and depth stop; Easy to install, assemble, and remove with great convenience. Features: Material: Aluminum alloy. Size: 21x12.5x9.5 cm/8.27x4.92x3.74 inch. Installation method: 1. Install a 35mm hole opener, adjust the drilling depth (usually 12-13mm), and then lock the limit ring. 2. Adjust the fixing size of the black pressure clamp of the quick clamp (note: this tool can adjust the size of the fixing plate to 15-25mm). 3. Move the punch to the board mark and punch position, and then lock the quick clamp. 4. Tighten the handle of the hole opener with an electric drill, press the hole into a depth of 12-13mm at a constant speed, and then drill 2mm screw holes on the left and right sides. Package Including:1 * Hinge punch positioner..Items from Sheng Xinshun's shop