2-piece automatic center punches one-handed operation, adjustable spring design, used to press firmly against the workpiece. Features: Includes a 6" automatic center punch (black) and a general automatic center punch (yellow). Features an adjustable spring design for variable impact resistance and a hardened tip for long lifespan. One-handed operation, simply adjust the desired spring tension, press firmly against the workpiece for automatic center punch. One-handed operation allows precise marks without the need for a hammer. Made in industrial black and chrome finish with knurled body for added grip Can be used for vehicle emergencies as a rescue glass breaking tool side window. Features: Material: brass + chrome vanadium steel Package weight: 171g / 6.03 ounces Package size: 155 * 45 * 45mm / 6.1 * 1.77 * 1.77in