... .M Width Wire Gauge (Diameter) BWG InchmmTolerance(mm)3/8"10mm±1.00.7mm - 1452' - 1M27, 26, 25, 24, 231/2" ... , 24, 23, 22, 215/8"16mm±2.00.7mm - 702' - 2M27, 26, 25, 24, 23, 223/4"20mm±3.00.7mm - 552' - 2M25, 24 ... , 23, 22, 21, 20, 191"25mm±3.00.9mm - 551' - 2M25 ... , 24, 23, 22, 21, 20, 19, 181-1/4"31mm±4.00.9mm - 401' - 2M23, 22, 21, 20, 19, 181-1/ ...