Sharp Marking Point: The sharp point marks workpiece with a dimple to create an exact starting spot for drill that prevents it from wandering. It works on just about any material softer than the point itself, including cast iron, mild steel, brass, bronze, copper, aluminum, wood, and even plastics and polymers. Precisely Machined: The tapered shaft and sharp point are precisely machined to meet exacting size tolerances, ensuring they are straight and true. Carefully Balanced: Made from premium, high carbon steel, each punch is individually heat treated to harden and strengthen the tip while maintaining the soft temper of the striking end so it can absorb hammer blows without chipping.