Metric system: tap diameter M3 * 0.5, M4 * 0.7, M5 * 0.8, M61.0, M8 * 1.25, M10 * 1.5Inch version: tap diameter 1/8 "(3.175mm), 5/32" (3.97mm), 3/16 "(4.76mm), 1/4(6.35mm), 5/16 "(7.94mm), 3 / 8 "(9.53mm)