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. Size 5 inches overall, with excellent durability. Composed with chrome plated 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 adjust the best tension on your work by rotating just the button. This will allow you to control the striking pressure of the double spring barrel and give you the correct indentation on the materials you are using. Comes with 2 spare tips with a hardness of 58. More than a center 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.