SEIWA Hishikiri No. 3 Hand Sewing Hole Punch Marking Tool, Uniform Blade Width Compatible with the blade width of diamond chisels. Because the blade width is uniform, the hole size does not change even if you insert it deeply. Correspondence table of "no" of Hishikiri and diamond chisels no.1 = 3mm width of diamond chisel no.2 = 4mm width of diamond chisel no.3 = 5/6mm width of diamond chisel How to use 1. Draw a groove or guideline to be opened with a stitching groover or divider. 2. Mark with a stitching roulette. 3. Open holes one by one, matching the angle of the diamond chisel. *After use, if you apply oil such as sewing machine oil or CRC and store it, the sharpness will last. #DiamondAwl #DiamondAwl #DiamondEyeAwl #DiamondEyeAwl #Hishikiri