The center punch is simple and accurate to use. Automatic design cleanly and accurately punches steel wood and . Features: Simple and accurate to use knurled handle prevents slipping. Gives precise starting point on steel and other solid materials. Allows you to easily mark work using one hand prior to drilling which will the drill from slipping. Automatic spring loads then releases at top of cycle with force to create center punch (No Hammer Needed). Spring pressure can be adjusted by simply rotating the knurled top of the punch.