High Quality: The drill bit adopts ultra-hard alloy which makes cutting sharper, unhindered chip removal with super reaming ability and excellent reaming performance. Hinge hole cutter: bore diameter is 35mm. Special removable depth stop design makes drilling easier. Concealed Hinge Boring Jig: Features a V locator that works off a center reference line and quickly locates center-drilling points for all brands of hinges and mounting plates Easy to use: easily and conveniently dip the cup hole on the cabinet door or desktop by yourself with the hinge drilling jig, suitable for their own home operation, even if you you are not professionals, you can quickly locate center drill points for hinges and mounting plates. Multiple use: suitable for drill press, pistol drill, bench drill, vertical drill, hand electric drill, stand motor drill and hand drill moving ribbon type magnetism, etc.The drill guide is widely used, which is suitable for carpentry DIY or professional engineers.