Automatic Number & Letter Punch

No need for a hammer. Place this punch on your work and press - the spring-loaded handle hammers your punch mark for you! Just insert one of the hardened punches into the handle, adjust the amount of tension needed to mark your wood or soft metal, and press down on the handle to mark. Set contains handle, 26 letters, 9 numbers, decimal point, ampersand, and plastic storage case.
Letters / numbers are 4mm tall by 3.5mm wide.