Caswick SS402 steps are suitable for fitting into new and existing brickwork. They are made from virgin polypropylene copolymer plastic, encapsulating galvanised steel. The steel is partially exposed to make fixing easier between courses of brick. Once fixed, the galvanised steel portion is encased in the wall of the chamber. Caswick SS204 version of these steps are reinforced with Grade 304 stainless steel to handle particularly corrosive environments.