Abstract: A chuck includes a generally cylindrical body and a plurality of jaws reciprocally disposed in the body in communication with a central bore in the body. A first detent extends radially into the central bore and is releasable in a radially outward direction. Upon insertion of an elongated tool shaft having a polygonal cross section into the bore so that a groove in the tool shaft is aligned with the first detent, the first detent engages the groove and axially retains the tool shaft. Upon movement of the jaws so that the jaw faces engage flat sides of the tool shaft, the jaws rotationally retain the tool shaft.

Abstract: A portable rotary power tool having an elongate auxiliary handle configured for securement to the power tool cooperates with the power tool primary handle to vary the reaction torque exertable upon the power tool by the user. The elongate auxiliary handle includes a fixed end attachable to the power tool motor housing and a free end extending outwardly generally away from the power tool output axis. A handle member provided adjacent to the free end to be grasped by a user includes a channel formed therein receiving a telescopic module. The telescopic module is adjustable relative to the handle member between a stored position received within the handle member and a plurality of telescopic positions.