53 Series Spool Insulators For Low Voltage 1,Material: Porcelain 2,Port:Fuzhou 3,Delievry time:20-30Days 4,Payment Term:T/T 53 Series Spool Insulators For Low Voltage 1)Series:53-1,53-2,53-3,53-4,53-5,etc.2)Material:Porcelain 3)Standard:ANSIMain Dimensions and Standard Paticulars