The 70079 utility automatic center punch can punch, mark, scribe and start drill, nail or screw holes. It is ideal for machinists and automotive repair pros. One handed spring impact operation, no hammer neededBall bearing actionLightweight aluminum body with knurled finger grip and durable alloy steel partsHardened steel pointOne handed operationSpring tension impact adjustments for working with lightermaterialsLightweight aluminum body with alloy steel internal components