Features: Made of high quality aluminum alloy, features high durability and strength, long service life. Use with electric drill (not included). Convenient and practical for drilling 35mm hinge hole. The hinge hole opener is marked with graduations for convenient and accurate use. Self-clamping type for quickly and tightly clamping, improve the efficiency of drilling, no need for pliers. Applicable wood board thickness: maximum 32mm. The distance between the hinge hole and the board's edge is adjustable from 4 to 7mm. Fits for installing most common hinges in kitchen caninets, doors, etc. Perfect woodworking tool. Small size, lightweight and space-saving, easy to carry. Using Steps: 1. Install the 35mm hinge hole opener. 2. Adjust the clamping depth (maximum 32mm) and lock tightly. 3. Use the electric drill, push down the hole at a constant speed to a depth of 12-13mm. 4. The distance between the hinge hole and the board's edge is adjustable from 4 to 7mm, which is suitable for most common hinges. 5. Install the 35mm hinge. Note: Size and color may be slightly different due to manual measurement and different lighting conditions. Thanks for understanding. Specifications: Color: Black Material: Aluminum Alloy Clamping Thickness of Wood Board: Max. 32mm Package Size: 21.5 * 9 * 7.5cm / 8.46 * 3.54 * 2.95in Package Weight: 468g / 16.51oz Package List: 1 * 35mm Hinge Hole Opener 2 * Allen Wrench 1 * 1/4in Dirll Socket