<p>Two synthetic resin structural members (11) are connected by placing a connector (22) having a plurality of holes formed therein into engagement with the two members (11), drilling a hole in one of the members in a position corresponding to one of the holes in the connector and securing a blind rivet (23) in the aligned holes. The drilling and riveting steps are repeated until the required number of rivets have been secured in both the members. If one of the members is hollow, the connection to it of the connector may be supplemented or replaced by a bolt (32) which passes through the connector and through the hole in a sleeve which is received in opposed holes in the wall of the hollow member. The nut is then tightened and the sleeve prevents the walls of the hollow member being deformed inwardly.</p>