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. 5" overall size, with excellent durability. Made 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 set the best tension on your work by simply turning the knob. This will allow you to control the striking pressure of the double-spring barrel and give you the right indentation on the materials you are using. 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 break the car window easily to help you escape in an emergency. Besides, 5" is very space-saving in cars. Product weight: 66 grams Quantity delivered: 1 piece, 2 spare punches become very rich