DURABLE MATERIAL: The center punch tip is made of high speed steel that holds up to strong impact, wear resisting and rust proof to prolong the punch life, high speed steel hardness: HRC58 ~ 60. MULTI-USE: Automatic center hole punch is suitable for a of tasks, such as on materials, car emergency tools, emergency hammer, and Iron plate positioning, wood positioning, wall positioning, etc. DESIGN: The pocket automatic center punch body has deeply knurled finger grip to achieve easy handling and better control; the non-pinch comfortable cap makes a for your palm against spring impact. IMPACT STRENGTH ADJUSTABLE: Impact strength adjustable, spring tension adjusts for light or heavy strokes, marking, punching and staking. HOW TO USE: Use head to align with the positioning point. Firmly press the handle and press it in the direction of the punch. After the punch is pressed back into the rod for a short period, the strong spring will vigorously eject the punch. Specifications Material: high speed steel Color: gold, silver, black Product Dimensions: 128mm/5 inch : 3 pieces Durable and practical. Perfect for Wooden planks, Fiberboard, Particle board, Plywood, Plastic, Alumiumn Board, etc. Package include: 1*center punch (gold) 1*center punch (black) 1*center punch (silver) Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.