The SE 795ACPC 5-Inch Automatic Center Punch features a brass body, hardened steel tip, and high tension spring. It punches, stakes, scribes, and marks wood, metal, plastic, and other surfaces to start drilling, nail, or screw holes, and eliminates the need for a hammer to do the job. This automatic center punch helps prevent screws, nails, and drill bits from moving around. The automatic action produces a hole when you apply downward pressure. You can change the amount of force per blow to control the size and depth of the mark.