The Allen wrench, also known as a hex key, is a L-shaped hand tool with ... For instance, Torx bits, which are shaped like stars, can fit inside a hexagonal fastener and be used as an Allen ...

At first glance the Allen wrench doesn’t seem to be much of a tool. It’s little more than a small, L-shaped piece of metal. But don’t be fooled by its humble appearance, the Allen wrench is ...