Features: Material: The centre punches tip is made of high speeds steel that holds up to strong impact, wear-resisting and rust-proof to prolong its punches life, high speeds steel hardness: HRC58~62. Ergonomic Design: The outside of the automatic centres punch has a deep knurled finger grip for easy one-handed operation and control. The pinch-free hat provides good cushioning for your-palm to prevent spring shock. Adjustable Impact Strengths: You can use the spring in that break tool to adjust the impact strengths for light and heavy strokes, marking, stamping and riveting. It can be used as-a car emergencies tool, broken glass window. Easy to Use: Firmly press its handle and press it in the direction of the punches, aligns with the positioning point, the strong spring will vigorously eject the punches. No need for tools such-as a-hammer. Multiple Uses: The automatic centres punch is suitable for various tasks, and is very suitable for marking or punching on wood, metal, aluminum, glass, plastic, leather or wall outside. Specifications: Material: High-speed Steel Color: Black Package Weight: approx.266g Outer Diameter: approx.12.7mm/0.49in Length: approx.130mm/5.12in (More Size Detail, Please See Photo.) Note: Please allow 1-3mm error due to manual measurement. Please make sure you do not mind before you bid. Due to the differences between different monitors, the picture may not reflect the actual color of the item. Thanks Package includes: 4Pcs x Automatic Center Punch