... ISO,IEC,CE,GB 5,Different size,color and packing Safety high of the Industrial Trunking 1,Tracking service2,Payment have L/C ... Quanlity System to manage our factory,Products have got the certification of UL,FCC,VDE,GS,CE,our factory follows "honest ... strong and has a unique Snap.5.The materia than any factory.But the different size have different price. Safety high of the Industrial Trunking