Feature: 1. Made of high-speed steel, has high hardness, fine wear resistance and heat resistance. 2. Wood chips will automatically drain from the holes on both sides of the t-op of the drill bit and will not catch the drill bit. 3. It is used to make the hole of the door and window hinge screw hole. The drill tapper can help fix the position and prevents slippage during the drilling process. 4. Includes seven different sizes of tapper to meet a variety of operational needs. 5. It is not only suitable for wood materials, but also for metal sheet punching of aluminum alloy doors and window or even stainless steel. Specification: This product is used for door and window hinge screw hole opening, drill sleeve can perfectly fix the position, ensure the accurancy of drilling, is an nice tool to improve the efficiency of drilling. Features: Made of high-speed steel, has high hardness, fine wear resistance and heat resistance. Wood chips will automatically drain from the holes on both sides of the t-op of the drill bit and will not catch the drill bit. It is used to make the hole of the door and window hinge screw hole. The drill tapper can help fix the position and prevents slippage during the drilling process. Includes seven different sizes of tapper to meet a variety of operational needs. It is not only suitable for wood materials, but also for metal sheet punching of aluminum alloy doors and window or even stainless steel. Specifications: Material: HSS Size: 5/64in, 7/64in, 9/64in, 11/64in, 5mm, 13/64in, 1/4in Open hole caliber: 5/64in: 2mm (use 2.2-2.8mm self-tapping screws) 7/64in: 2.8mm (use 3-3.5mm self-tapping screws) 9/64in: 3.5mm (use 4-4.5mm self-tapping screws) 11/64in: 4.5mm (use 5-5.5mm self-tapping screws) 5mm: 5mm (use 5.5-6mm self-tapping screws) 13/64in: 5.2mm (use 6-6.5mm self-tapping screws) 1/4in: 6.35mm (use 7-7.5mm self-tapping screws) Package size: 100 * 100 * 50mm / 3.9 * 3.9 * 2.0in Package weight: 240g / 8.5ounce Packing List: 7 * Hinge Tapper 1 * Wrench Package List: 7 * Hinge Tapper 1 * Wrench