Easy to use with one hand without a hammer. Mark a dimpled starting point on metal (steel, aluminum, brass, copper), wood, glass, leather or plastic surfaces, prevents drills or the screws to slide. Total size of 13cm, with excellent durability. Composed with chrome tip and high quality stainless steel body, with non-slip knurled texture giving you very comfortable and precise operation. With the tension screw, you can set the best tension for your job by just turning the knob. This will allow you to control the striking pressure of the double spring barrel and give you the correct indentation on the materials.that you use. The package comes with 2 spare tips of hardness 46 and 58, providing more options for your job. More than a central punch, it is also a safety tool in the car. This product is capable of working on glass, which means that it can easily break the car window to help you escape in an emergency.In addition, 13cm is very space-saving in cars.