... .We could manufacture variety of cable stringing pulley block/ stringing blocks/conductor pulley block/MC nylon pulley block/tackle professionally. Product:660mm Large ... conductors,OPGW,ADSS, communicatio lines.We have the 1,3,5,7 sheaves,nd the diameter is 508mm,660mm,820mm,916mm ... .c.The sheave of the pulley blocks are made from higth strength MC nylon,or aluminum materials ,and the frame of ...