HIGH QUALITY: The drill bits are made of high hardness alloy for sharper cutting, smoother chip removal, superb reaming capacity and excellent reaming performance. Reamer: Hole diameter 35mm. The special design of the removable depth stop makes drilling easier. Invisible Hinge Drilling Jig: Includes a V-shaped mark to quickly locate the center point of the drill hole from a center reference line, suitable for all brands of hinges and mounting plates. EASY TO USE: Use the hinge drilling jig to easily and conveniently drill holes in cabinet doors or tables, for your own work at home, even for non-professionals, you can quickly locate the center point of the drilled holes for hinges and mounting plates. MULTIPLE: Suitable for drill presses, drill presses, bench drills, vertical drill presses, handheld drills, stand drills and mobile magnetic drills, the drill guide is versatile and suitable for DIY enthusiasts and woodworking professionals. 1) INSTALLATION INSTRUCTIONS QUICK HINGE