Disclosed is an apparatus (10) for connection to a flange (52) of a post (50). The flange (52) comprises two or more elongated apertures (54) therethrough which are spaced out along the length of the flange. The apparatus comprises a body (12) from which there extends two sets of projections (14A&B) and (16A&B). Each projection in each set respectively extends from the body to a distal end (18). Each of the sets (14), (16) comprises two projections A&B which extend from the body so as to define a recess R therebetween which is configured to receive the flange (52) therein. The distal ends (18) of the two projections (14) or (16) in a given set are able to locate in adjacency of a respective one of the elongated apertures (54) in the flange. At least one of the distal ends of at least one the projections comprises a passage (20) formed thereat. The passage (20) has a profile configured in a similar manner to that of the flange elongated aperture (54) adjacent to which it can be located in use. A respective pin (32A), (32B) is provided for each of the projections. The pins are connected together by a bridging member (34). When the passage (20) is located in adjacency of a respective flange aperture (54), the pins (32A), (32B) are each able be inserted through a respective passage (20) aligned with a respective aperture (54) to secure the apparatus (10) to the post.