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 box Grommet 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 Eyelets size: 1/ 2 inch (13 mm) internal hole diameter, 4/ 5 inch outside flange diameter, and 1/ 5 inch barrel length; With a plastic storage box: about 5.5 x 3.2 x 1.3 inch/ 14 x 8 x 3.3 cm, good for storing small grommet tool, easy to fetch and apply when you are sewing Reminder: this product is metal, it is not recommended to be wetted; considering the quality of the grommet, do not use too much force during installation to avoid the hurt to the grommet