... (Diameter)BWGInchmmTolerance(mm)3/8"10mm±1.00.7mm - 1452' - 1M27, 26, 25, 24, 231/2"13mm±1.50.7mm - 952' - 2M25 ... , 24, 23, 22, 215/8"16mm±2.00.7mm - 702' - 2M27, 26, 25, 24, 23, 223/4 ... 21, 20, 19, 181-1/4"31mm±4.00.9mm - 401' - 2M23, 22, 21, 20, 19, 181-1/2"40mm±5.01.0mm - 451' - 2M23 ... , 22, 21, 20, 19, 182"50mm±6.01.2mm - 401' - 2M23, 22, 21, 20, 19, 182-1/2 ...