Easy one handed operation without the need for a hammer. Mark the starting point of the pit on the surface of metal (steel, aluminum, brass, copper), wood, glass, leather, or plastic to prevent the drill bit or screw from sliding. The total size is 12.7 cm, made of excellent composite material with chrome plated tips and high-quality stainless steel body, with anti slip knurled texture, providing you with very comfortable and precise operation. Using tension screws, simply turn the button to adjust the optimal tension applied to the work. This will allow you to control the strike pressure of the dual spring cannon and provide the correct indentation on the material you are using. The packaging is equipped with 2 replacement end pieces with a hardness of 58. It is not only a center punch, but also a safety tool inside the car. This product can work on glass, which means it can easily break windows and help you escape in emergency situations. In addition, the 12.7cm size saves space in the car.