Hex keys and Allen wrenches are basically the same, with the name Allen coming from the company that manufactures the tool. An Allen wrench and hex key reference an identical L-shaped tool with a ...

There's also SAE and metric standard 14-piece hex key sets and 8-piece short arm hex key sets, as well as multiple screwdriver bit sets and nut bits that range from 4-12mm and 3/16-½-inch.