Our pick: Amazon Basics Hex Key Allen Wrench Set with Ball End Runner-up: Bondhus 20399 Ball End L-Wrench Double Pack Also great: 12522 Bondhus GorillaGrip Hex Fold-up Double Pack ...

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.

Most DIY furniture kits come with an Allen wrench that fits the included hex screws. But that little, unmarked wrench is easy to lose or misplace, so it’s best to have a set of Allen wrenches on ...