... couplings. Material: Carbon steel, stainless steel. Unitary Clamps, Heavy Duty Clamps, A type heavy duty pipe couplings.Material: Carbon steel, stainless steel ... Alloy, Zinc Alloy etc.With many years service experience in this area, our products are totally exported to oversea clients, and ... ,welcome friends to make investigation,negotiation and cooperation. Unitary Clamps, Heavy Duty Clamps.