Converts 3 or 4 lamp F40T12 recessed 2X4 fixture to 2- F32T8 system. •U.L. Classified. •Fits the majority of existing recessed 2X4 fixtures. •Kit includes brackets, tek screws, lampholders. •95% specular reflectivity for maximum light output. •Width = 21.25', Depth = 2.44', Length with brackets = 48' •Typically used to convert 4F40T12 magnetic to 2-F32T8 electronic •25 year warranty.