BUD Industries BT-2742 Polycarbonate NEMA 4X Box, 11-51/64" Length x 9-3/64" Width x 3-3/8" Height, Transparent Blue Transparent blue polycarbonate design reduces the need to remove cover to verify NEMA protection UL listed to UL508-4X specifications (file# E194432) Internal guide slots for mounting PCB assemblies vertically on some models UV stabilized polycarbonate with UL94-V2 flammability rating External measures 11-51/64" length by 9-3/64" width by 3-3/8" height; internal measures 11-9/16" length by 8-13/16" width by 3-7/64" height