To prevent drills and screws from wandering in metal, wood, or plastic, use the Automatic Center Punch to mark a dimpled starting point. Quick and easy to use, it delivers an automatic spring-driven strike when it's pressed against a surface. An adjustable allows you to regulate the striking force. The premium brass body has a deeply knurled nonslip surface for sure handling and control. Features - Color: As shown. - Size: 13 x 1.3 x 1.3cm. - Material: Brass. - The force of the center punch can be adjusted through the cap, no need to use hammers. - The Brass Body has a diamond pattern deeply ridged surface it shouldn't slip. - One-handed spring-loaded impact operation, no hammer required. - Automatic center punch will mark, scribe, punch start drill, nail or screw holes. - Can be used for vehicle emergencies as a side window glass breaking tool.