High Quality: The drill bit features ultra-hard alloy for sharper cutting, smooth chip removal, and excellent reaming performance. Hinge hole cutter: 35mm bore diameter. Removable depth stop design for easier drilling. Concealed Hinge Bore Jig: Includes a V locator that aligns with a center reference line to quickly locate center points for drilling, compatible with various hinge brands and mounting plates. Easy to use: Enables precise cup hole drilling on cabinet doors or desks using a jig, ideal for home DIY use. Users without professional experience can easily locate drilling centers for hinges and mounting plates. Multiple uses: Compatible with drill press, pistol drill, bench drill, vertical drill, hand-held electric drill, stand motor drill, and magnetic base drill. The drill guide is widely applicable for woodworking, DIY projects, and professional applications.