Flexible Mandrel 3.5" (88.9 mm) maximum rated capacity 4800 pounds (21.3 KN). Useful for cleaning out mud, dirt, and light obstacles from ducts before installation of cable. Can be used around tight bends due to convex contacts between disks. Tapered profile allows pulling in either direction. Pulling eyes on both ends. Polyurethane disks do not damage inner walls of duct.