High Quality Chrome Vanadium Steel combines both METRIC and SAE Hex Key Wrench in one box Modern storage box made of pure ABS for the ease of recycling Available for the service tool cart Clear size marking for long-lasting purpose Short Metric:1.5-2-2.5-3-4-5-6-7-8-10MM; Short SAE:1/16-5/64-3/32-1/8-5/32-3/16-7/32-1/4-5/16-3/8"