Abstract: A ratchet wrench usable where limited access normally requires an open end wrench, but which has the high torque capacity of a closed end socket wrench is disclosed. A pair of semicircular socket holders are releasably coupled to each other by a straight ratchet bar assembly for movement from a fully retracted, closed position to an extended, open position. A curved, semiconductor bore is formed transversely through each socket holder, with a recessed counterbore forming a semicircular guide chanel in each holder concentric with the transverse bore. First and second socket segments are received in rotational engagement with the guide channels of the first and second socket holders, respectively. Each socket segment includes a curved head having lands which in combination define a polygonal wrench opening. A curved ratchet carried by each socket segment is received in overlapping engagement with an exterior planar face of each socket holder.