Spring-Impact Marking Automatic Center Punch,Handle Material:Brass.Tip Material and size:S2,5/8''(1.7cm) shank Diameter,length:6'' Made of a well machined brass body and has a deeply knurled surface which means that it will not slip and offer more precise handling and control Spring inside handle and saving strength, Just a simple push of hand to activate the strike for a uniform punch again and again Easily hold and non-slippery handle,Spring inside handle and saving strength Mar hole centers in metal and other materials.Use before drilling to prevent your drill bit from wandering when starting a hole. Also can be used as glass window breaker for occasion or as spring loaded awl for belts and purses.