Metal building material; small items of metal hardware; walkways of metal; handrails of metal materials for walkways; metallic mounting clips for mounting walkways and support structures to a roof; walkway mountings, clamps, frames, supports and componentry made principally of metal; pre-fabricated support structures made principally or wholly of metal for roof mounting; parts and fittings for the foregoing

Non-metallic building material; rails, rods and balustrades, all predominantly non-metal; handrails of non-metallic materials for walkways and non-metallic mounting clips for mounting walkways and support structures to a roof; parts and fittings for the foregoing