... efficiency 3.low noise 4.steady performance Ningbo Excel small ball joints 1.full inch and metric dimensions series ... Material in carbon steel, alloy steel and stainless steel, aluminum alloy,Structure of steel to steel, steel to liner or ... PA and PTFERod body: carbon steel, alloy steel, stainless steel, aluminum alloySurface treatment: polish, zinc plated, chrome plate, phosphorlylated, passivate, ...