Specification: Material: high quality steel, Not easy to rust. Hole Diameter: about 1mm Hole spacing:4mm 5mm 6mm 8mm Package include: choose the pcs or set from the menu. Suitable for hand sewing steering wheel set set punching, seam of large leather goods, hand sewing sofa seat cover. Notes: 1.Because the row and the limit of the production process, some of holes will not be completely on the same line, and each row of blunt tip cannot do exactly the same(a little High and low error), It can be solved through put a waste leather between leather and base plate when punch. 2.As time goes on, may be it can be oxy-genated,and get rusty.