[Unique Design]Non-slip knurled surface on spring-loaded shaft allows for comfortable working, the non-pinch comfortable cap makes a good cushion for your palm against spring shock, the precision center point increases control for more accurate holes. [Has Many Uses] Automatic Center Punch Force is suitable for punching on steel sheet, aluminum, copper, wooden board and other materials for positioning holes, and prevents nails or screws from moving. [Adjustable Impact Resistance] Center punch impact resistance is adjustable, the spring tension adjusts for light or heavy blows, marking, punching and pricking. No hammer needed, with this automatic center tool, you can do it quickly. [High Quality Material] Automatic center punches spring is made of high speed steel which can hold up to strong impact, wear-resistant and does not rust to extend its service life. [Service of [quality]Use this automatic punch for metal, wood, glass, canvas, plastic and leather. Quantity delivered: 4 pieces,"