1)main material:porcelain 2)IEC,ISO9001,ANSI standard 3)Samples avaiable 2012 ceramic pin insulator 56-21) main material:porcelain2) standard: IEC,ISO9001,ANSI3) Samples ... avaiable4) OEM/ODM5) Item no.: 56-1, 56-2, 56 ... your reply! we will arrange everything for you. 2012 ceramic pin insulator 56-2