Specification: This automatic center punch is 13 cm long and 1.1 cm 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 needle punch has a built-in tension adjustment spring, and the cover can be adjusted clockwise or counterclockwise. Application: The automatic spring center punches can be used as a manual punching tool compatible with wood, metal and glass; it can also be used to break car windows for escape in an emergency. Material: The needle shell is made of high carbon steel and the built-in spring is made of stainless steel, which is waterproof. Quick positioning opening: The self-centering punch uses the internal spring to generate the impact force to open the item hole, without the use of a hammer to strike, and the operation is simple. Features: Made of high carbon steel and stainless steel, high strength and not easy to break. The diamond pattern on the surface increases the friction between the hand and the handle, and the anti-slip effect. The high-strength spring can adjust the product effect. Compact appearance, easy to carry. In an emergency, you can break the car windows to escape. Can be used compatible with wood, metal or glass. Specifications: Material: High carbon steel, stainless steel. Size: 13cm long, 1.1cm diameter Packing List: 2 x Auto Punch 2 x Spare Tips