Product name: industrial automatic central puncher Case material: pure copper Product length: total length 13.2 cm < p>Thinger material: steel 60 chrome vanadium gold Spring material: solid steel Product features: Use the spring in the body to generate impact force to drill. Delivery quantity: 1 piece Color yellow Characteristics: Material: Knurled steel structure - aluminum alloy tip. Colour: gold. Length: 132 mm. Precise and easy to use. Knurled handle for a better grip. Provides a precise starting point for steel and other solid materials . To easily make the centering marks before drilling. The adjustment of the locking spring is done according to the material to be drilled - for precise and easy marking - no need 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.