Abstract: This invention relates to a universal tool-holder, usable as an accessory in tightening or untightening screwable members by a suitable tool.The problem posed is to improve the leverage and manipulation of the tool.In accordance with the invention, the tool-holder comprises a hollow grip (1), and a rotary head (3) secured axially to the grip (1) for rotation relative to the grip, the rotary head (3) presenting an axial aperture (5) and radial aperture (7) which receive and mate with an end of the tool, a locking screw (9) being screwed into a tapped radial aperture (10) in the head (3) to engage and lock the tool in the head. The grip may then be used as a lever handle or a crank handle to apply torque to the tool.The invention is especially applicable to such tools as a box spanner, a pipe spanner or an Allen key.