1.UL certificate 2.600V2000W 3.specialize in producing lamp holder over 30 years 4.factory direct price 5.ODM & OEM is OK UL porcelain Edison screw E39 lamp holder MT547 1. Product Information: MT547 E39 lamp holderMaterialPorcelain/CeramicCertificateULRate600V2000WWire3135,16# 200°C 600V, 11cmOverall height66mm, with +/-0.1mmOutside lookGlazed yellow porcelain bodyFittingPositioning screw ...