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.

Abstract: A slim profile wrench is provided for reaching nuts and bolts in tight spaces. The wrench includes first and second casing members which encloses a chain trained about sprockets at opposite ends of the wrench. Each sprocket includes an integral female drive and an integral female socket on opposite ends. Rotation of a drive shaft inserted into the female drive rotates the female socket at the opposite end via the chain. The casing members are secured together by fasteners extending into a central wall within the casing members. The wall also defines spaced apart channels which provide a guide track for the chain. Wear bushings are provided on each side of each sprocket.