High quality: The drill bit adopts ultra-hard alloy which makes cutting sharper, chip removal unhindered with outstanding reaming capacity 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 drilling center points 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 hinge drilling jig, suitable for their own operation at home, even if you are not not professionals, you can quickly locate drilling center points for hinges and mounting plates. Product Features: 1. Hinge punching locator, made of ABS plastic, lightweight and portable, easy to use 2. The rotating head is made of alloy, sharp and durable, and can cut continuously 3. Suitable for furniture door cabinet hinge positioning and installation Instructions: 1. Determine the hinge position, with the short board facing up, attach the screws to the edge of the board and drill the hinge holes; 2. Draw the corresponding center line on another board, with the short board facing down, the center line aligned with the inverted triangle, and drill the locating hole for the hinge seat; 3. Install the hinge. Delivery list: 1 * hinge opening locator set