3/8" Dr Cr-v Flare Nut Crowfoot Wrench With Rail Set Imperial:

Also used in place of conventional open/box wrenches where the wrenches are large, so the crow's-foot wrench is much cheaper, or where space and weight are at a premium. 8pc 3/8" drive imperial set size included : 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4", 7/8".