Flexzion Hex Key Wrench 30 PC Combo Set SAE/MM Metric Size Wrenches Long Short Arm Functional Hand Tools With a Neat Blow Mold Case for Storage Allen wrench set w/SAE & Metric size allen wrenches; Heat treated carbon steel with black-oxide finish Precisely-sized, chamfered ends insert smoothly into fastener head, reducing wear Includes SAE sizes from. 035" up to 3/8", Includes Metric sizes from 0. 7mm up to 10. 0mm High visibility sizes marked on case for fast size selection; Great addition to any toolbox includes hard to find sizes Hinged storage case opens flat, making it easier to get wrenches in and out