YHT steel junction box 1, Material--zinc steel plated 2, Shape-- square 3, Size--H50, H60, H70, H80, H100 YHT steel junction box1, Material--zinc steel plated2, Shape-- square3, Usage--popular in the building construction4, Size--H50, H60, H70, H80, H1005, Others required by the client YHT steel junction box