The door and window hinges must be fixed on the door and window with screws. This product is used to drill screw holes for door and window hinges. The drill guide can fix the position well, ensure drilling accuracy and improve your work efficiency. Go ahead and try it, it won't disappoint you. Features: Made of brass cover and HSS material, which is not easy to damage and has a long service time. Precise positioning when using, will not move and give you a better using experience. Wood chips will automatically flow out of the holes on either side of the top of the bit and will not catch the bit. Includes 4 different tap sizes to meet a variety of operational needs. Suitable for you to use in your daily DIY or carpentry work, has wide application. Features: Material: HSS Size: 5/64 inch, 7/64 inch, 9/64 inch, 11/64 inch Open hole gauge: 5/64 inch: 2mm (use 2.2-2.8mm self-tapping screws) 7/64inch: 2.8mm (use 3-3.5mm self-tapping screws) 9/64inch: 3.5mm (use 4-4.5mm self-tapping screws) 11/64inch: 4.5?mm (use 5-5.5?mm self-tapping screws) Package size: 110 * 60 * 30mm / 4.3 * 2.4 * 1.2in Package weight: 98g/3.5oz Packing List: 4 * Hinge Tap