Specifications Tip Material: High Speed Steel; Handle Material: Brass; Hardness: HRC58-65; Length: 127mm/5inch Widely Application This is an automatic center punch used to produce a dimple in a workpiece. It performs the same function as a regular center punch but without the need for a hammer. The center hole punch is also a great tool stored in the car to be used to break the window in an emergency. Usage When pressed against the workpiece, it stores energy in a spring, eventually releasing it as an impulse that drives the punch, producing the dimple. The impulse delivered to the tip of the punch is quite reproducible, which allows for uniform impressions. Free Your Hands The self-centering punch has an internal spring mechanism that allows them to mark materials without using a hammer, leaving you one hand free to stabilize the work. Note To prevent the direct grinding position from slipping or being pulled out by rotating automatically, resulting in damage to the drill bits, use the automatic center punch tool to mark a point. Description: To prevent the direct grinding position from slipping or being pulled out by rotating automatically, resulting in damage to the holes, use the automatic center punch tool to mark a point. The center punch is also a great tool stored in the car, used to break the window in an emergency. Specifications: Tip Material: High Speed Steel Handle Material: Brass Hardness: HRC58-65 Length: 127mm / 5inch Golden Color Package: 1 x Automatic Center Punch