A connection arrangement (10) for connecting perpendicular first and second tubular members (12, 14). The arrangement (10) including coaxial circular and larger square openings (20, 22) provided on opposite faces of the tubular member (12). A circular opening (24) is provided in the second tubular member (14) alignable with the openings (26, 28) further openings are provided in the member 14 on either side of the opening to receive a face of the first member (12) when abutting against the second member (14). A nut (36) is trapped behind the opening (24), and a bolt (38) can extend through the two openings (20, 22) in the first member to engage with the bolt (38) to retain the members (12, 14) together.