Are T-slot tables necessary and is it worth paying more for steel?

T-Slot Guide steel t slot extrusion APPLICATIONS - End to end but joint of profiles - Profile extension ; TECHN DATA ITEMS SUPPLIED - 140mm long steel T shaped bar, zinc plated steel t slot extrusion STAINLESS STEEL DROP IN T NUTS 4040 - 8mm Slot Profiles STAINLESS STEEL DROP IN T-NUTS FOR 8MM SLOT 40 SERIES ALUMINIUM EXTRUSION PROFILES

steel t slot table All t-slot extruded aluminum systems are engineered for a precise fit and maximum rigidity Forget the hassles and inflexibility of steel