Lightedge Grateoptic 8" x 1 1/2" RectangularEGRM9 1 T5/T5HO GRATEOPTIC, EGRM9 2 T5/T5HO GRATEOPTIC, EGRM9 3 T5/T5HO GRATEOPTICHousing and endcap AA 6063 T6 extruded aluminum forming a 8 1/8" x 1 1/2" rectangular channel.Die - formed reflectors with baked white enamel finish (nominal reflectance 90%) and a specular aluminum side reflector. Satin anodized standard; custom colors available.Specify 120 volt, 277 volt, or 347 volt. UL and C-UL listed and labeled.