High Quality: The drill bit adopts ultra-hard alloy which makes cutting sharper,chip removal unhindered 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 Bore Jig: Features a V locator that works off a center reference line and quickly locates center points drill hole for all brands of hinges and mounting plates Easy to use: easily and conveniently dip the cup hole on the cabinet door or desk by yourself with the cup hole jig hinge drilling,suitable for their own home operation,even if you are not professionals,you can quickly locate the center points of drilling for hinges and mounting plates. Multiple use : suitable for drill press,pistol drill,bench drill,vertical drill,hand-held electric drill,stand motor drill and moving tape type magnetism drill ,etc.The drill guide is widely used.ized,which is suitable for carpentry DIY or professional engineers.