High Quality: The drill bit is made of ultra-hard alloy, which makes cutting sharper, chip removal unhindered, and has excellent friction capacity and performance. Hinge Hole Cutter: Hole diameter is 35 mm. The special design of the removable depth stop makes drilling easier. Concealed Hinge Drilling Jig: Includes "V" Works according to a central reference line and quickly finds the drilling centers for hinges and mounting plates of all brands. Easy to use: Easily and conveniently plunge the cup hole into the cabinet door or desk yourself with the hinge drilling jig, suitable for DIY at home, even if you are not a professional, you can quickly find the drilling centers for your hinges and plate assembly. Multiple uses: Suitable for drilling machines, pistol drills, bench drills, vertical drilling machines, electric hand drills, pedestal motor drills and moving belt magnetic drills, etc. The drilling guide is widely suitable for carpenter DIY enthusiasts or professional engineers.