Premium Quality: Made of high-quality environmentally friendly metal and engineering plastic, this hinge drilling guide is durable and can be used for a long time with excellent touch. Convenient to Use: It is easy to use, suitable for your own use at home, which does not need professionals and is the ideal DIY woodworking tool. Features a V-shaped locator that works on a center reference line. High Precision: The hole position is accurate, drill hinge holes easily and quickly. Makes cabinet door installation easier. Drill Guide Jig: The jig can be adjusted to change the door edge, and the drill is good for removing debris and working efficiently. Features: 1. Forstner drill bit for cleaning holes in soft and hard wood. 2. The concealed hinge drilling jig is made of impact-resistant polycarbonate and is ideal for drilling. Features: Material: ABS. Bore Diameter: 35mm. Shank Diameter: 8mm. Package Included: 1 x Hinge Boring Jig. 1 x Adjustable Positioning Drill Bit (Red or Blue) How to Use: 1. Determine the position of the hinge cup, the short board facing up, the screw is fixed on the edge of the board, drill the hinge hole. 2. Draw a corresponding center line on the other board, the short board is facing down, the middle line is aligned with the inverted triangle, drill the hinge base positioning hole. 3. Install the hinges.