Kyoshin Elle Professional Diamond Hole Punch (5mm width, 1 tooth) This item was used in a classroom setting. Due to its age, the design differs from the currently sold Professional Diamond Hole Punches. Price is not negotiable. This punch allows you to make holes without making noise. For use with leather 2.0mm thick or less, or soft, thin leathers such as chrome-tanned leather, the teeth may not align properly, and holes may not be punched.