5-INCH - PREMIUM AUTOMATIC CENTER PUNCH: Make it easier to drill automatic hand punch tool with a spring-loaded mechanism that works and makes a solid mark in wood, metal, steel, aluminum, brass, copper and more. The Tool Heavy Duty Automatic Center Punch Includes 2 Automatic Center Punches in a Zippered Hard Shell Storage Case ONE-HANDED OPERATION. NO HAMMER REQUIRED: Strike Once and Done. These premium center punches offer one-hand operation when marking hole centers with precision and accuracy. Press down on the punch handle to mark hole centers. Now you will be able to start the pre-drilling process or make reference marks with ease HARDENED ALL-STEEL CONSTRUCTION: Our automatic center punch is made of hardened steel and has a deeply knurled surface which means that it will not slip while offering more precise handling and control. Long lasting fine point tip. Overall Dimensions Measure 5" x -Diameter Shank ADJUSTABLE TENSION: The Tool Automatic center punch forms a large enough dimple to "guide" the tip of the drill. For lighter marks simply release some tension by unscrewing the end cap. When fully unassembled the point can be removed for sharpening or replacement