General description Easy one-handed operation without a hammer, the Pack 5" Spring Loaded Automatic Center Punches are designed for marking dimpled starting points on various surfaces including metal (steel, aluminum, brass, copper), wood, glass, leather, and plastic. This prevents drill bits or screws from slipping. The tool features an overall size of 5 inches, ensuring excellent durability and space-saving convenience in cars. Made with a chrome-plated tip and a high-quality stainless steel body, it has a non-slip knurled texture for comfortable and precise operation. The tension screw allows you to set the optimal tension for your work by simply turning the knob, controlling the striking pressure of the double-spring barrel for the right indentation on your materials. This product also serves as a safety tool in emergencies, capable of breaking car windows to facilitate escape. Technical specifications Overall size: 5 inches Material: Chrome-plated tip and stainless steel body