Ken-Tool Power Wrenches - 3-Pc. Set, Model# 34543 Designed for dual nut systems Has 13/16in. square end to hold inner nut and 1 1/2in. hex drive to spin outer nut off Can be adapted to remove any nut size with TR55 adapter 3-to-1 ratio provides mechanical power advantage needed to remove any stubborn nut found on trucks, farm vehicles, buses, aircraft and RVs Allows one-man operation