Automatic center features adjustable strength, adjustable spring tension for light or heavy strokes, marking, punching, and staking Screw the cap in when it is heavy, turn the cap up gradually mark marks at the point uniform depth and size per setting Each center has a chrome plated shank body that can withstand strong force and resistance. Super strong carbon steel tip withstands hard surfaces The 5" center is perfect for keeping your set in your home, garage or toolbox. These are the best automatic metal centers Automatic center punch knurled surface and center tip provides increased control for more precise and accurate holes, Manufacturer: Rxgiasup