Punch mark scribe and start nail or screw holes with ease using the General Tools 87 Pocket Automatic Center Punch. It features a lightweight aluminum construction for optimal durability and has knurled grips for a firm textured hold that also improves precision. The replaceable alloy point provides longer wear and the tension mechanism is conveniently adjustable for making light or heavy markings as needed. A pencil-slim design with a pocket clip make this spring-loaded center punch easily portable. It s suitable for making holes or indentations on numerous materials such as wood plastic and metal.