This tungsten celtic knot flat ring measures 8mm or 0.32 inches wide and is highly scratch resistant and hypo-allergenic. The perfect addition to any jewelry collection. This ring is available in sizes 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, 10, 10.5, 11, 11.5, 12, 12.5, 13, 13.5 & 14.