Crowfoot wrenches are open-end-style wrenches that can access fasteners from the top and side like an open-end wrench. They look similar to an open-end wrench, but only include the wrench head and have no shaft or handle. Wrenches can be attached to the drive end of a ratchet, socket handle, or extension and can reach fasteners in tight spaces. Crowfoot wrench sets have multiple head sizes so they can be used with a range of fasteners.