5 inch automatic center hole punch suitable for construction and automotive use.Chrome plated diamond knurled textured body withstands high impact force, provides resistance to corrosion and dirt as well as a nonslip grip.Sharp and durable tip made from premium S2 steel with a hardness of 58-60 for continuous easy and precise punching.Adjustable ball end cushioned cap increases and decreases strike force and allows for comfortable grasping which makes the centre punch easier to use.Ideal for accurate drilling applications and can be used on a variety of materials such as metal, wood, glass, leather and plastic.