Sizes include: 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4", 13/16", 7/8", 15/16", 1". The GearWrench Ratcheting Crowfoot Wrenches provide improved access to bolts located in hard to reach places or confined spaces. Used with a 3/8” extension, these ratcheting wrenches allow you to reach deep into an engine compartment or to avoid obstructions which prevent the use of a ratchet.