Used- Rio $9.49
This plastic finger gauge set ensures a good fit for narrow rings and measures US and French sizes, as well as diameter and circumference. The set features 36 high-impact, durable, color-coded plastic gauges, each stamped with sizing information. One side of each gauge is stamped with U.S. sizes (1–15) and diameter in millimeters (13–24.2mm); the other side is stamped with French sizes (1–36) and circumference in millimeters (41–76mm).