【Material】Mark a starting point with pins made of metal (steel, aluminum, brass, copper), wood, glass, leather, or plastic and prevent drills or screws from slipping. 【Adjustable】The automatic center punch has a built-in spring to adjust the tension. You can adjust the cover clockwise or counterclockwise to achieve the desired setting and ensure a secure hold. 【Wide Application】The automatic center punch can be used as a manual punch tool on wood, soft metal, and glass. It may also be used to break glass in emergency situations. 【Easy to Use】Simple one-handed operation without the need for a hammer. Ideal for users who require single-handed functionality. This self-activating punch is a practical addition to any household tool kit. 【Specification】The metal punch is 128mm (5.04 inches) long and 11mm (0.43 inches) in diameter. The set includes two automatic center punches and two replacement tips. The compact design makes it easy to carry. Note: All measurements are manually taken. Please allow 1–3 cm variation due to human error. Color may vary slightly due to lighting and display differences. Actual product received may vary slightly from images shown.