We may receive a commission on purchases made from links. The Allen wrench, also known as a hex key, is a L-shaped hand tool with hexagonal (six-sided) ends. It all started with a Connecticut ...

The Allen wrench has a flexible angle design that can easily be used in small and hard-to-reach places. Each key can be folded back into the handle, which is made from a soft rubber and ABS ...

They're so named because you need an Allen wrench (aka an Allen key or hex key) with a hexagonal socket to tighten them. The hexagonal shape provides six points to apply pressure to the fasteners ...