【Standard Size】The inner diameter of the eyelets: 10mm/0.39 inch; outer diameter: 18mm/0.7 inch; height: 5mm/0.2 inch. 100 sets of grommets can meet your needs. 【Product Content】 The grommet kit contains a hole punch pliers, a suitable mandrel and 100 sets of 10mm grommets (each set contains 1 grommet + 1 washer) + a transparent storage box. 【Brass Material】 The 10mm grommets for tarpaulin are made of high quality brass with electroplated finish, which has good corrosion resistance and bright appearance, not easy to rust. 【Storage Box】 The product comes with a storage box with a lid, suitable for storing grommets, you can put the product in the storage box after use, convenient for next use, also easy to store and access. 【Utility】 This grommet kit is suitable for curtains, canvases, tarps, tents, leather, sample books, pool covers and other fabrics that need to be perforated.