High quality material: The outer shell of the spring center punch is made of high carbon steel, and the built-in spring is made of stainless steel, which makes it waterproof and rustproof, very strong and durable. The tension screw allows you to adjust the better tension on your work by simply turning the knob. This allows you to control the impact pressure of the double spring shaft and gives you the correct notch on the materials you are using. Package includes 2 leather punch tools and 2 spare bits, thus providing more options for your work. Easy to use: Easy one-handed, hammer-less operation. Anyone who only has one hand to punch will not want to miss this tool. You'll find the Self-Scratching Center Punches to be a great addition to the home toolbox. Versatile: The Self-Scratching Center Punch can be used as a manual punch tool on wood, metal, glass; it can also be used to break car windows so you can escape in an emergency. Description: Made of high carbon steel and stainless steel, high strength, no easy to break, durable. - The diamond pattern on the surface increases the friction between the hand and the handle, which gives a good anti-slip effect. - Suitable for punching on the steel plate, aluminum, copper, wood panel and other materials with locating holes. It is also a great tool for the car to break the windows in case of emergency. Specifications: Material: Carbon steel Length: 130 mm Colour: black silver Package includes: 2 x Automatic punch 2 x Replacement punch Features: Made of high carbon steel and steel stainless, high strength not easy to break, durable The diamond pattern on the surface increases the friction between the hand and the handle, good anti-slip effect. The high-strength spring can adjust the effect of the product. -Compact appearance, easy to carry. Easily hit the car window to escape in an emergency. Can be used on wood, metal or glass. Wide application: 1, The center punch tool is very useful for marking thin metal sheets and drilling car windows in the event of a car accident. 2, You can try it on different surfaces, density wood different to metal, it works well. 3, Also use this product in model building, body or chassis. Tips: 1.Product related size is manual measurement, there may be slight error, please understand. 2.Due to shooting equipment and light reasons, the product may have a slight color difference.