Abstract: As shown in FIG. 3, a connector comprises a body (1) and a plurality of detachable connecting members for connecting the body (1) to a rod or tube, wherein the body (1) is provided with a plurality of threaded apertures (11) for receiving threaded end portions of the connecting members. The connecting members are form-locked to the connector body (1) to prevent relative rotation, by means of a hexagon head solid with the connecting member and received in a corresponding recess (12) in the connector body (1), thus preventing relative rotation between the connector body (1) and connecting member (31). In a preferred form, the connector body (1) is a pentagonal prism having two pairs of adjacent faces (4,5;6,7) at 90.degree. and the remaining three pairs (5,6;7,8;8;4) at 120.degree..