Our hole pipes are ideally suited to punch holes in leather, synthetic leather, felt and many other materials. Please note that the product delivered corresponds to the selection criteria in the shopping cart and the selected size refers to the perforation diameter. It is a variation offer - each product can be selected separately and placed in the shopping cart. Details: Available in many sizes, optimal for the perforation of leather, synthetic leather, biothane and felt. 2-part perforated tool: hole punch including brass an ambboss up to size 17 mm. Plastic ambuses are included for 21 mm and 28 mm. Suitable for use with presses. Thread: 1/4 " - 20 UNC stamp below: 12 mm Note: Not suitable for pliers. Important information: Before buying, make sure that the thread of the tool matches the.