Grommet Kit: Includes 100pcs grommet eyelet kit (with 100pcs grommets and washer, individually packed in a PE bag), a punch tool and a fixed tool, all in a damage-free plastic box. Size: Inner diameter: 12mm (1/2 inch) and outer diameter: 21mm (5/6 inch). With a plastic storage box, approx. 6.9 x 3.9 x 1.3 inch / 14 x 8 x 3.3 cm Excellent material: The grommet kit are made of quality copper-nickel and electroplated on the surface, with high corrosion resistance and shiny appearance, very not easy to oxidize. Easy to use: The grommet eyelet kit makes installation easy. First use the hole punch tool to punch a hole in the tarpaulin (fabric), then take the grommet set, and finally fix the grommet set with the attached tool. Please put a rubber pad or wooden board when punching holes to prevent the hole puncher from getting blunt. Wide range of uses: The grommet kit is suitable for canvas, tarpaulins, tents, curtains, backpacks, leather crafts, repair and decoration. (materials with a thickness of less than 1 mm)