This kind of lamp holder is made of a new type Oxide-Al-Ceramics, which has a smooth surface and can bear much more compaction. 1)high temperature resistance 2)Good Insulation 3)Universal types for your requirements 4)Competitive prices Types:H4 three holes , 9004 two holes,9005 two holes, H7 two holes, H1 one holes,H1 and H7 vertical ,9004 and 9007 three holes, five holes rely holders.