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).

These models can be used to tighten both hex nuts and bolts as well as 12-sided ones, so they can save you from having to buy more specialized tools. Open-End Wrenches Are Best For Fast, Easy Projects ...

If you're using an impact wrench, you're aiming to use a device that gives you plenty of torque, but will you sacrifice that ...