Product Name : Automatic center punch Punch material: chrome vanadium diamond punch / tungsten steel punch Spring material: solid steel Product use: used to punch materials such as wood, iron, aluminum, glass, etc., do not hit stainless steel and marble, the punch is not hard enough. Product features: use the impact force produced by the spring in the body for drilling holes. [Marking Center]: Provides an accurate starting point on steel and other solid materials, allowing you to mark easily work with one hand before drilling, preventing the drill from slipping. [Product material]: The tip of this automatic center punch is made of steel, which has high strength and durability. Delivery Quantity: 3pcs, Package Contents: Only the above package contents, excluding other products. Size: 132*13*13mm (Reminder: The size is measured manually, please allow 1-2 cm measurement error) Color: Gold+Black+Silver (Due to different monitors and lighting effects, the actual color of the item may be slightly different from the color shown on the picture.)