1.Material: Carbon steel,SS304,316 2.Size:RD6 - RD42 Usually 3.Length:50 - 128 Name:Stainless Steel CouplingMaterial:Carbon ... steel,Stainless Steel 304/316,or other steelSize:RD6 - RD42,M6 - M42,1/4 - 1Length:50 - 128 mmThread:Metric,UNC ... and cooperative relationships with overseas customers based on mutual benefits. RD12 - RD42,M6 - M42 Stainless Steel Coupling