... Clamps, Heavy Duty Clamps, A type heavy duty pipe couplings. Material: Carbon steel, stainless steel. Unitary Clamps, Heavy Duty Clamps, A type heavy duty pipe couplings.Material: Carbon ... clamps.++Plastic, Poly, PVC, Nylon injection parts.++Mold Design.Material available: Ductile Iron, Gray Iron, Stainless Steel, Carbon ... investigation,negotiation and cooperation. Unitary Clamps, Heavy Duty Clamps.