Breynet 7pcs Self-centering drill bit, Wood Doors Self Center Hinge Core Tapper Drill Bit Set 5/64'' 7/64'' 9/64'' 11/64'' 13/64'' 5mm 1/4'', Automatic Spring-Loaded Center Hole Punch Tool Set 5 inch

7pcs Hinge Hole Drill Bit Positioning: Spring loaded outer guide with chamfered head keeps the high-speed drill centered for perfect pilot holes, making it easy to drill precise holes High speed steel drill bit and brass body with electroplating; Adjustable drill depth; Remove drill for easy replacement. The nosepiece bevel centers itself in the hardware's countersink; Standard 1/4" hex shank fits all power bit and quick-change chucks. Highly accurate bits are used for drilling pilot holes in cabinet and door hinges, door butts and all large and small hardware Accurate drilling exact pilot holes in cabinet door hinges, door butts, handles, drawer slides, and more Material: high-speed steel Type & Dimension: 5/64'': Hole diameter is about 2mm, use about 2.2-2.8mm tapping screw. 7/64'': Hole diameter is about 2.8mm, use about 3-3.5mm tapping screw. 9/64'': Hole diameter is about 3.5mm, use about 4-4.5mm tapping screw. 11/64'': Hole diameter is about 4.5mm, use about 5-5.5mm tapping screw. 5mm: Hole diameter is about 5mm, use about 5.5-6mm tapping screw 13/64": Hole diameter is about 5.2mm, use about 6-6.5mm tapping screw. 1/4": Hole diameter is about 6.35mm, use about 7-7.5mm tapping screw. Note: Please adjust according to the hardness of the wood, if the wood is soft, choose a smaller size; if the wood is hard, you can choose a larger size or corresponding opening tool. 5inch center punch tool principle uses the internal spring-driven automatic impact force to easily punch, crush, and position. Suitable for all types of materials such as wood, plastic, general metal, glass, leather, walls and more. Can be used as a glass window breaker, a drill locator, an escape hammer, a puncher, etc. to achieve a variety of functions. Set the position of the punch point, rotate the top cap to adjust the spring pressure, and press the force to press the center punch at the fixed position.