[Material] The drill bit is made of super hard alloy, sharp and smooth. The hinge locator is made of ABS plastic. [Dimensions] The hole diameter is 35mm, the total size of the locator is 77 x 66mm and the total size of the hinge hole is 80 x 35 mm. [Concealed Hinge Drilling Tool] The "V" locator protruding from the center of the reference line can quickly locate the center point of the drill bit. all hinges and mounting plates. [Precise hole position] The hinge positioner has precise hole positions. The hole is fixed and not easy to move. The hole opener has a scale to help you locate it accurately when installing. [Multiple use] Suitable for drills, bench drills, vertical drills , etc. All wood and wood products, plastics, plywood and other materials you need are extremely perforated, suitable for industrial hinge installation, wood processing and maintenance, model making, etc.