681-50120 Features: -Automatic center punch.-Material: Steel.-Rugged automatic punches with all-steel handles and parts.-Internal mechanism automatically - strikes a blow when downward pressure is applied.-Spring tension, which regulates the blow, is constant so marks made by the point are uniform in depth and size for each setting.-The point can be easily removed for regrinding or replacement.-Adjustable knurled cap regulates the force of the blow.-Punch Diameter: 9/16. Dimensions: -Length: 5.