Specifications:This automatic center punch is 13cm long and 1.1cm in diameter.The set includes two automatic center punches and two spare punches.The appearance is small and easy to carry. High quality material: The needle shell is made of high carbon steel and the built-in spring is made of stainless steel, which is waterproof and rustproof, high strength and durable. Quick: The self-centering punch uses the internal spring to generate the impact force to open the hole of the article, without the use of a hammer to strike, and the operation is simple. Adjustable: The automatic needle valve has a built-in tension adjustment spring, and the cover can be adjusted clockwise or counterclockwise to make it perfect. Wide Application: The automatic spring center punches can be used as a manual punching tool on wood, metal and glass; it can also be used to break car windows for emergency escape. Features: Made of high carbon steel and stainless steel, high strength and no easy to break, durable. The diamond pattern on the surface increases the friction between the hand and the handle, and the anti-slip effect is good. The high-strength spring can adjust the effect of the product. Compact appearance, easy to carry. In an emergency, you can easily break the car windows to escape. Can be used on wood, metal or glass. Specifications: Material: High carbon steel, stainless steel. Size: 13cm long, 1.1cm in diameter Packing List : 2 x Automatic punch 2 x Spare tips Tip: 1.The relevant dimensions of the product are measured manually, there may be slight errors, please understand. 2.Due to the shooting equipment and light, the product may have a slight chromatic aberration.