BUD Industries BT-2740 Polycarbonate NEMA 4X Box, 9-7/16" Length x 6-19/64" Width x 3-17/32" 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 9-7/16" length by 6-19/64" width by 3-17/32" height; internal measures 9-5/32" length by 6-1/64" width by 3-1/4" height