A bracket (60) for securing a first kickboard (62) transversely of a second kickboard (54) comprises a socket (64) for receiving an end of the first kickboard and a clip (70) for securing the bracket to the second kickboard, the clip comprising a lateral extension (76) aligned with the longitudinal axis of the second kickboard for stabilizing the bracket thereon. Also disclosed are (1) a telescopic rail (46) for use in forming a guard or safety barrier for builders' trestles, staging, scaffolding or the like, comprising inner and outer telescopic parts (80, 82), in which the inner part is prevented from sliding free of the outer part in use; (2) a brace for stabilizing adjacent trestles; (3) a ladder support bracket; (4) removable safety rail components and (5) a longitudinal kickboard bracket attached to a trestle crossmember.