Super Strong Automatic Center Punch Kerner Positioning Spring Loaded Adjustable Marker Wood Glass Press Dent Metal Drill Features *High carbon steel treatment to prevent skidding. *The mark will prevent slipping before drilling. *Automatically load the spring and then forcefully release the loop to create a center punch (without hammer). *Spring pressure can be adjusted by simple rotation to adjust knurling. *Automatically designed clean and accurate boxing wood and plastic Specifications *Product Name: Automatic Center Punch *Material: High carbon steel + alloy steel *Color: Silver+Black(As pictures show) *Diameter: approx. 12mm/0.47inch *Size: approx. 128 mm/5.04inch *Quantity: 5pcs Package Content 1*Center punch 4*Punch Needle Note 1.Transition: 1cm=10mm=0.39inch. 2. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 3. Please allow slight manual measurement deviation for the data.