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The Keystone CFS/K-150 Extra Heavy Duty Cavity Wall Lintel, measuring 4800mm in length, is engineered specifically for supporting substantial loads over cavity wall openings between 150mm and 165mm wide. This specialist lintel is the go-to choice for builders and contractors needing reliable structural integrity on large-scale or heavy-duty projects. Please note that all mortar joints must be fully filled, and lintels should be propped during construction to ensure safety and performance.