Economy Leather Stitching Punch Set (Pricking Irons) Economy Leather Stitching Punch set, diamond style pricking irons for leathercraft. The set comes complete with four punches, including punch tools with 1, 2, 4 and 6 prongs. These entry level tools are recommended for use on leather up to 2mm thick. Product Dimensions The stitching punch tool measures 100 mm total length. Each prong measures 9.8 mm long. The 3 mm punches produce a 3 mm wide stitching hole at 1 mm spacings (9 stitches per inch). The 4 mm punches produce a 4 mm wide stitching hole at 1 mm spacings (7 stitches per inch). The 5 mm punches produce a 5 mm wide stitching hole at 1 mm spacings (6 stitches per inch). Please note: these economy punches are recommended for lighter use on leather up to 2 mm thick. If you are punching through thicker leather please see our Kemovancraft diamond stitching punches (for up to 3mm), or for leather over 3mm thick use the heavy duty leather punches by Sinabroks For best use, and to avoid damage to the tools, use with a rubber punch mat such as our leather punching mat or Poundo board, and use a specialised leather mallet such as our heavy leather mallet