QUANTITY: The grommet tool kit includes a hole punch, a matching mandrel, and 100 sets of grommets (each set includes 1 grommet and 1 washer) and a storage box. WIDE APPLICATION: These durable tarp grommets are suitable for denim, canvas, tarps, tents, awnings, and other fabric items or other materials with a thickness of less than 1mm. EASY TO USE: The grommet kit makes installation easier. First, use the hole punch to make a hole in the tarp (fabric), then take the grommet set and finally fix the grommet set with the included tool. Place a rubber mat or a wooden board when making holes to prevent the hole punch from becoming dull. HIGH QUALITY: Made of high-quality copper-nickel 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. 14 x 8 x 3.3 cm.