Unitary 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 steel, stainless steel. Our ... Bronze parts,++Flanges & Valve Parts,++Steel and Stainless steel Hose clamps.++Plastic, Poly, PVC, Nylon injection parts.++Mold Design.Material available ...