Specifications: This automatic hole punch is 13 cm long and has a diameter of 1.1 cm. The set includes two automatic hole punches and two spare punches. Its compact design makes it easy to carry. High-quality material: The needle shell is made of carbon steel, and the inner spring is made of stainless steel, which is waterproof and rust-proof, high-strength, and durable. Fast: The self-centering punching device uses an internal spring to generate a blow to open the object's hole. No hammer is required for striking, and it is easy to operate. Adjustable: Automatic needle valve with built-in tension adjustment. Also used for breaking car windows in emergency situations. Features: Made of carbon steel and stainless steel, high-strength, not easy to break, and durable. The diamond-shaped pattern on the surface increases the friction between the hand and the handle and has a good anti-slip effect. The high-strength spring can adjust the effect of the product. Small appearance, easy to carry. In an emergency, you can easily break through the window to escape. Can be used on wood, metal, or glass. Specifications: Materials: High-carbon steel, stainless steel Size: Length 13 cm, Diameter 1.1 cm Packing List: 2 x Automatic Acupuncture 2 x Replacement Tips Reminder: 1. The relevant dimensions of the product are all manually measured, and there may be slight errors, please understand. 2. Due to the shooting equipment and light, the product may have slight color differences. Nice to meet you."