Easy one-handed operation without a hammer. Mark a dimpled starting point on metal (steel, aluminum, brass, copper), wood, glass, leather or plastic surfaces, prevents drill bits or screws from slipping. Total size of 12.7 cm, with excellent durability. Composed with chrome tip and high quality stainless steel body, with anti-slip knurled texture giving you very comfortable and precise operation. With the tension screw, you can set the best tension for your work by simply turning the knob. This will allow you to control the strike pressure of the double spring barrel and give you the correct indentation on whatever materials you are using. Supplied with 2 spare tips with a hardness of 58. More than a central punch, it is also a safety tool in the car. This product is capable of working on glass, which means it can easily break the car window to help you escape in an emergency. Also, 5 inches is very space saving in cars.