Quality material: the punching tip of the automatic center punch is made of high-speed steel (HSS), which has high hardness, durability and wear resistance; The shell of the automatic center punch is finely processed, with deep knurling on the surface, non-slip, not easy to rust, damage or break, and can serve you for a long time.^ With a spring loaded mechanism that actually works and makes a solid mark in wood, metal, steel, aluminum, brass, copper and more. This Forge Industrial Brass Center Punch gives your drill a start point and makes it easier for you so it doesnt slip in tight spots. Don't let your drill walk again!^ Easy to use: the 5 inch center punch has an adjustable tension, so you can use it easily with just one hand, and no other tools are needed, just adjust it to the desired spring tension, press it steadily on the work piece, then automatic center punching can be performed.^ Safety tool: the automatic manual punching tool with a spring-loaded mechanism is applied in wood, metal and other materials; Before punching, accurate marking and positioning can be carried out without a hammer, non-slip spring loaded punch tools save you time and energy.^ Wide applications: automatic center punch is multi-functional and can be applied in many occasions, suitable for positioning steel, aluminum, iron, PVC, steel, walls, wood, etc., this automatic center punch is not only for wood and metal but able to shatter glass car windows which means that you can leave one in your car and always be prepared.