Specification: 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. Adjustable impact force: The automatic punch has a built-in tension adjustment spring and the cover can be adjusted clockwise or counterclockwise to make it perfect. Wide application: The spring loaded automatic 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 escape in an emergency. 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 rust-proof, high strength and durable. Quick positioning opening: The automatic centering punch uses the internal spring to generate the impact force to open the hole of the item, without the use of 'one hammer to hit, and the operation is simple. Features: Made of high carbon steel and stainless steel, high strength and not 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 :13 cm long, 1.1 cm in diameter Packing list: 2 x Automatic punch 2 x Replacement tips Tip: 1.The relevant dimensions of the product are measured manually, there may be slight errors, please understand. 2.Due to the equipment of shooting and light, the product may have slight chromatic aberration. luckymeet