All the letters and numbers are constructed of heavy-duty steel. Each number or letter measures approximately 5/32 inch (4 mm). These punches are great for jewelry and other intricate designs. The number 6 can be used as 9. Each punch measures approximately 2 3/8" x 1/4" (60 x 6 mm). Comes in an organized wooden storage box with labels for each spot your set stays in order. Features include:One set of 27 letter punches A - Z with the "&" symbol One set of 9 number punches 0 - 8 Wooden storage case