Product Name : Industrial automatic center punch Shell material: pure copper Product length: total length 13.2cm Thimble material: 60 chrome vanadium gold steel Spring material: solid steel Product features: Use the spring in the body to generate impact force to drill holes. Shipping quantity: 1 piece Color yellow Features: Material: Knurled steel structure - aluminum alloy tip. Color: Gold. Length: 132 mm. Precise and easy to use. Knurled handle for better grip. Gives a precise starting point on steel and other solid materials. For making the centering marks before drilling made easy. Detent spring adjustment is made according to the material to be punched - for precise and easy marking - no need for a hammer. You can adjust the spring pressure by simply turning the upper knurled part. Automatic and precise - suitable for steel, wood and plastic. Package contents: 1 x automatic punch.