simply adjust to desired spring tension, press firmly against work piece for automatic centre punch, it makes accurate marks without the need for a hammer.The spring loaded center punch is sturdy, durable and has high impact force, which can be used quickly. The center punch tip is made of high speed steel that holds up to strong impact, wear resisting and rust proof to prolong the punch life, Its thimble hardness reaches 58-65. Compared with the conventional center punch, the spring loaded center punch does not need a hammer to strike, but uses the internal spring to generate impact for positioning, which is more convenient and durable. Automatic center hole punch is suitable for a variety of tasks, such as mark on materials, car emergency tools, furniture installation, machine maintenance, alternative emergency hammer, and Iron plate positioning, wood positioning, wall positioning, etc.Suitable for wood, iron, ordinary steel and other materials. the impact force can be adjusted at will, you can simply tighten the cover clockwise or counterclockwise, and then fix it to a fixed hole, so you can get the depth you need. Spring tension adjusts for light or heavy strokes, marking, punching and staking. According to the ergonomics, the non-slip diamond pattern design is adopted, which can increase the friction between the hand and the spring loaded center punch handle during operation, so that it is easier to maintain vertical to the workpiece, and it is easier to force the positioning hole.