Specifications: This automatic center punch is 13 cm long and 1.2 cm in diameter The set includes two automatic center punches, which are compact and easy to carry. High quality material: The needle case is made of high carbon steel and the inner spring is made of stainless steel, which is waterproof and rustproof, high resistance and durable. Quick: The self-centering punch uses the internal spring to generate the impact force to open the hole of the object, no need to use a hammer to knock, and the operation is simple. Adjustable: The automatic needle loom has a built-in tension adjustment spring, and the lid can be adjusted clockwise or counterclockwise a watch to make it perfect. Wide Application: Automatic spring center punch can be used as a manual punch tool on wood, metal and glass; it can also be used to break car windows for emergency escape. Product Description Features: Stainless steel, high strength, not easy to break, durable. The diamond-shaped 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 window to escape. Can be used on wood, metal or glass. Specifications: Dimensions: length 13 cm, diameter 1.1 cm