Abstract: An improved wrench includes a housing with opposite first and second ends and a pair of gears rotatably mounted in the first and second ends respectively. Each gear has a cylindrical sidewall with opposite ends and a plurality of teeth forming a sprocket extending radially outwardly from the sidewall between the opposite ends. A chain is trained about the gears within the housing. Upper and lower bushings are mounted in each end of the housing adjacent the sidewall of the respective gears to prevent contact between the gear sidewall and the housing.