The tip of this automatic punch is made from high speed steel for high strength and durability. No hammer needed, with this automatic center tool you can create a dimple in a workpiece quickly and easily Usually used to mark the center of a point, the small dimple guides the drill tip and avoids the slippage or deviation which results in damage Suitable for punching on the steel plate, aluminum, copper, wood board and other materials at the positioning holes It is also a great tool kept in car for breaking windows in emergency This is an auto punch used to produce a dimple in a part. It performs the same function as a normal centering punch, but without the need for a hammer. When pressed against the workpiece, it stores energy in a spring, then releases it as an impulse which moves the punch, producing the dimple. The pulse supplied to the punch is quite repeatable, which allows uniform engravings. Typically used to mark the center of a point, the small dimple guides the tip of the burr and prevents slippage or deviation which leads to damage. Suitable for punching steel, aluminum, copper plates, wooden boards and other materials for hole placement. It is also a great tool kept in the car to use for breaking windows in an emergency. Weight: The normal model weighs 67 grams Material: the head punch is made of high-speed steel, with a hardness of HRC58-60. Size: The total length is close to 130mm, the shank diameter is 12.7mm, and the punch head diameter is about 0.6mm. Features: The inner spring structure of the center punch can provide strong impact force to finish steel plate, wood punching, broken windows and other tasks. If you are stuck in the car due to an emergency, you can use this center to break the window to escape. It's simple and easy to use, and the effect is immediate! How to use: Use the heavy head to align the positioning point, hold the handle firmly and press against the punch. After the punch is pushed into the shank for a short time, the strong spring will force the punch to eject, create a dent for each point, no need to cooperate Tools such as hammers are easy to use. Note: The data is manual measurement, please allow 1-44cm error, due to differences between light and screen, there will be a certain color difference, the specific received in nature prevail.