Description: An automatic center punch is a hand tool used to produce an indentation in a part.It performs the same function as a regular center punch but without the need for a hammer.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 repeatable, resulting in uniform impressions. Features: Bit material: High speed steel Handle material: Brass or steelcarbon Tip hardness: HRC58 ~ 65 Length: 130mm / 5.12 " Handle diameter: 13mm Color: gold, silver (optional) quantity: 1 Package includes: 1x automatic center punch