[Metal Grommet Size] --- Inside diameter: 5 MM (0.2 Inch), outside diameter: 9 MM (0.32 Inch),barrel length is 3.6 mm (0.14 inch)[Wide Usage] --- The easy-to-use grommet kit is suitable for shoes, clothing, shoelaces, projects, tarps, awnings, and leather crafts and adding ornament to your crafts etc.[Easy Storage] --- All 400 grommets sets and tools can be put in storage box with removable baffle to separate these compartments, which is convenient to find the corresponding componentsThe structure is .Rustproof durable, performance is good, Color chips does not off.Installation steps:1.Making a hole with a punch tool.2.Put the back of through a hole from a front of clothes and a washer on the back of from a back of clothes.3.Face to the base and wear on the base.4.Push the install rod on washer and hammer the grommet We 't recommend to use these grommets for thick fabric (such as blankets). the thickness of leather does not 6 OZ. Lightweight fabrics,mesh ,knitted fabrics, stretch fabrics and fabrics with wear on the surface should be lined on the back to prevent from breaking and tearing the fabricNote: keep from children to avoid choking.Color: silver + black + green + goldmaterial: metalPackage Contents:400 * Grommets (4 colors and 100 sets each color )3 * Tools1 * Storage boxOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.