(57) A clip (1) for retaining a picture in place in a picture frame, which clip comprises a boss (2) having on one end portion a transversely extending elongate locking arm (4) and having on the other end portion a flange (3), the cross sectional configuration of the boss being such as to facilitate rotation of the boss within a complementary hole (5) defined in a backing substrate (6) of a picture frame so that the arm can be rotated to engage the picture frame, with the flange located on the picture side of the backing substrate and the locking arm located on the other side of the backing substrate, whereby the picture is retained in place by the backing substrate.