MaterialMark a starting point with pins made of metal (steel, aluminum, brass, copper), wood, glass, leather or plastic and prevent drills or screws from slipping. AdjustableThe automatic center punch has a built-in spring to adjust the tension, you can adjust the cover clockwise or counterclockwise to get it just right and hold very well Wild ApplicationAutomatic center punch can be used as manual punch tool on wood, soft metal, glass; it can also be used to smash car windows to allow you to escape in an emergency Easy to Use: Simple one-handed operation without a hammer. Anyone who only has one hand available to strike won't want to be without this tool. You will find the self-punching punches to be a good addition to the household tool kit. SpecificationMetal grit is 128mm (5.04 inch) long and 11mm (0. 49 inch) in diameter. The set contains two automatic center punches and two replacement punches. The outer shape is compact and easy to carry Product Information - Product Name: Automatic Center Punch< /p> - Material: Stainless Steel, High Carbon Steel - Length: 128mm (5.04 inch) - Diameter: 12.5mm (0.49 inch) Scope of delivery: 2 * Automatic Central Punch 2 * spare tips< /p> Features: - The metal punch is made of high quality metal material, sturdy and durable. - A high-strength spring can regulate the impact of the product and will strike a punch when downward pressure is applied. - Automatic center punches with handles and parts fully made of steel, the tip can be easily removed for resharpening or replacement. - Diamond pattern on the surface increases the friction between the hand and the handle, good anti-slip effect. - Appearance compact, easy to carry. Can be used on wood, metal or glass. Warm advice - Manual measurement, please allow slight errors in size. - Color may vary slightly due to the color calibration of each individual monitor. - If you have any questions about using the Cereal Kit, please don't hesitate to contact us. We will solve your questions as soon as possible.