Rivets

A rivet for fastening workpiece members, the rivet comprising:

• a body comprising a shank extending in a first, longitudinal direction and a head with a portion thereof extending in a second, substantially transverse direction, the transversely extending portion of the head being radially enlarged relative to the shank, a bore being defined through the shank and the head;
• and,
• a stem comprising a main longitudinal portion arranged for insertion into said bore, and an enlarged portion arranged for radially expanding the shank when the enlarged portion is forced into said bore to fasten the workpiece members;
• the rivet being configured for insertion into respective apertures formed in the workpiece members;
• and
• wherein the rivet being further configured such that when the workpiece members are fastened, the radially enlarged and transversely extending portion of the head experiences pivotal displacement relative to the shank to engage with the stem to lock the stem in place relative to the body and/or the workpiece members.