1.Pin type insulator, 2.Used for telephone lines, 3.Main types:RM-1 RM-2 RM-3 ... Premium Quality & Modern Technology & Attractive Price, 1.Pin insulators for telephone lines2.Material: porcelain3.Color :white4.Payment term: L/C; T ... lamp holder, socket, plug, light, switch, connector, fuse, insulator, spindle, cable, doorbell, test pen, etc. And most of our products have ...