Steel made Tube Fittings are available for 4mm to 42mm tube od, 1/4"OD to 2"OD tube, 1/4"NB to 2"NB Pipe. These Tube Fittings are made from quality grade carbon steel and brass. These Tube Fittings are heat treated to withstand suitable working pressure. These Steel made Tube Fittings are suitable for working pressure of 630bar max.