... polybags then Inner box then outer packing. 7. Available size: Metric: 8mm_25mm SAE: 5/16"_1". Metric: 8, 9, 10, 11, 12 ... , 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25mm. Imperial: 5/16" 3/8" 7/16" 1/2" 9/16" 5/8 ... " 11/16" 3/4" 13/16" 7/8" 15/16" 1". Selling point: Reliable ...