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