QUANTITY: The grommet tool set includes a hole punch, a matching mandrel, and 100 sets of grommets (each set includes 1 grommet and 1 washer) and a storage box WIDELY USED: These durable tarpaulin grommets are suitable for denim, canvas, tarpaulin, tents, awnings, and other fabric items or other materials with a thickness of less than 1 mm EASY TO USE: The grommet eyelet kit makes installation easier. First, use the hole punch tool to punch a hole in the tarpaulin (fabric), then take the grommet set, and finally secure the grommet set with the attached tool. Please put a rubber pad or a wooden board when drilling holes to prevent the puncher from getting blunt. HIGH QUALITY: Made of high quality cupronickel and electroplated surface, with very good corrosion resistance and glossy appearance, not easy to rust. SIZE: Inner diameter: 10 mm (2/5 inch) and outer diameter: 18 mm (7/10 inch). With a plastic storage box, approx. 6.9 x 3.9 x 1.3 inch / 14 x 8 x 3.3 cm