... range of products that are perfectly compatible with each other: aluminum, steel, stainless steel, or PVC windows and doors, sky-frames, sliding windows, verandas and glass roofs, curtain walls, solar protection, fire-resistant elements, aluminum cassette facades, sheet metal cladding, guardrails, balconies, steel or stainless steel stairs and walkways, handrails, metal canopies, special constructions, and safety barriers in steel and wood.