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This automatic center punch can also be kept in your car as a reliable emergency window breaker, ready to help you escape quickly if needed. The tip is made from high speed steel, giving it excellent strength and long lasting durability for repeated use. No hammer required — simply press down and this self centering punch creates a clean dimple in the workpiece quickly and easily. Works well on steel plate, aluminum, copper, wood plank, and other materials to mark or position holes with . Use it to mark the center of a point before drilling — the small dimple guides the drill tip and prevents slipping or wandering that could damage your workpiece.