Allen wrenches and Hex keys seem very similar to each other. We break down the relationship between the two and some other innovations that have come since.

Which brings us to the “Sears Craftsman T Handle Ball End Hex Key Allen Wrench Set” (Sears item #00946380000; model #46380). Tool aficionados have their favorite brands for sure. A Snap-On owner ...

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 ...

Today, the wrench is referred to as an Allen wrench, an Allen key, or hex key. These tools are available in fractional inch sizes (1/4 inch, for example) and metric (4 mm, for example).

Make sure the Allen wrench is inserted all the way into the head of the screw. It should sit at a nice 90-degree angle, ensuring you don't strip the screw. Use the long end to rotate the Allen ...

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 ...