Abstract: Apparatus for tightening or loosening a plurality of bolts or other rotatable elements in which a drive socket and a pair of reaction sockets are supported by an elongated beam member. The drive socket is placed on a selected rotatable element to be turned, and the reaction sockets are placed on additional rotatable elements on opposite sides of the selected element. The reaction sockets are slidable along the beam member to accommodate different distances between the rotatable elements and may be locked in place in their proper positions. During the turning movement, the beam member and the reaction sockets apply force to the additional elements in a direction opposite to the force applied to the element being turned to thereby prevent any significant movement of the additional elements and their supporting structure.