Abstract: A double-ended ratchet, or socket, wrench with (1) an elongate body has (2) a rotatable turning head at each end of the elongate body, and (3) a mechanism within the body for mechanically linking at a non-unitary ratio both rotation, and torque, of each turning head to the other. Each, and either, turning head may be (2a) a cylindrical body typically with a square or twelve-point interior aperture, or (2b) a square spindle, each presenting at its exterior surface (2c) sprocket teeth. The (3) rotational linkage mechanism can be any of (3a) a continuous loop chain, (3b) a train of intermeshing gears, or (3b) a drive shaft, each engaging the exterior surface (2c) sprocket teeth of each (2) turning head so as to link rotation, and torque, of each (2) turning head to the other. Depending upon the non-unitary drive ratio, and end-to-end orientation of the tool, either torque may be magnified at the expense of drive speed, or drive speed may be magnified, as in a speed wrench, at the expense of torquing force.

Abstract: A shallow-well socket suitably driven by the drive post of a rotary tool to apply torquing force to, and to turn, a fastener having a head of thickness H. In one embodiment the shallow-well socket has a generally tubular body of length C less than or equal to two and one-half times the thickness H of a head of a fastener that is turned by the body, C≦2.5H. A distal-end region of length D internally suitable to fit the head of the fastener, ½H≦D≦H, connects to a central region of length E serving as a back wall to a distal-end cavity 0≦E≦½H, connects to a proximal-end region of length F internally suitable to fit over the drive post of a rotary tool, ½H≦F≦H. D+E+F=C.

Abstract: A double-ended ratchet, or socket, wrench with (1) an elongate body has (2) a rotatable turning head at each end of the elongate body, and (3) a mechanism within the body for mechanically linking rotation of each turning head to the other. Each, and either, turning head may be (2a) a cylindrical body typically with a square or twelve-point interior aperture, or (2b) a square spindle, each presenting at its exterior surface (2c) sprocket teeth. The (3) rotational linkage mechanism can be any of (3a) a continuous loop chain, (3b) a train of intermeshing gears, or (3b) a drive shaft, each engaging the exterior surface (2c) sprocket teeth of each (2) turning head so as to link rotation of each (2) turning head to the other. In use one end of the tool is directly or indirectly mounted to an object that is desired to be rotated and/or torqued, normally in tight confines.