Craftmemore Metal Push Snap Together Grommet is the perfect solution for any project requiring a flat surface snap ring. This easy-to-install pack of 4 comes in 11mm (7/16"), Silver and features a 5mm (3/16") inside diameter, 10mm (3/8") outside diameter, and 3mm gap (after install). It also includes a 17mm (11/16") inside diameter, 30mm (1-3/16") outside diameter, and 5mm gap (after install). Installation is simple and requires only a light weight hammer. For instructions, search for "Snap Together Grommet Demo" on YouTube. Craftmemore Metal Push Snap Together Grommet is the perfect choice for any project requiring a flat surface snap ring. Get yours today!