This high Hardness punch head are suitable for all types of materials such as wood, plastic, general metal, glass, leather, walls and more. Knurled steel surface for anti-skid control. Alloy steel tip points provide an accurate starting point. Feature - Color: As Shown. - Material: Alloy Steel. - Size: 10.1 x 10.1 x 0.8cm. - Multiple Used: These Alloy center punch can be used as a glass window breaker, a drill locator, an escape hammer, a puncher, etc. to achieve a variety of functions. - Positioning use: Set the position of the punch point, rotate the to adjust the spring pressure, and press the force to press the center punch at the fixed position. - Rust Proof: These hole punch tool has a pure copper shell and will not rust for long-term use. Warm Tip: Dear buyer, Due to lighting effect, monitor's brightness, manual measurement and etc, there could be some slight differences in the color and size between the photo and the actual item. Sincerely hope that you can understand