• Buyer's note: 6mm, 12mm, and 14mm are all made of stainless steel, while 10mm is made of electroplated iron, which has a relatively strong hardness.Diverse combinations: grommet kit set includes a hole cutter, a matched mandrel and 100 sets of grommets eyelets (each set includes 1 eyelet and 1 washer), and a storage boxGrommet tool kit: provide an economic solution for repairing canvas, tarps, tents and pool coverings, good for shoes/ shoelaces, clothing, crafts projects, etc.Easy to use: easy to set the grommets eyelets in place with the hole cutter and matched mandrel; The mandrel has a distinctive pattern on the surface, non-slip provides more secure grips