Most people have encountered an Allen wrench (or Allen key). It’s the L - or S -shaped tool with a six-sided head that can ...

Allen wrenches are vital to any handyman's toolkit. They are formed from hexagonal-shaped steel rods bent 90 degrees at one ...

An Allen wrench, AKA an Allen key or hex key, is a small hand tool used to fasten screws or bolts with a hexagonal socket. Either end usually works, although some sets only have one end.