1.Type:Concentric and eccentric reducers 2.Seamless: 1/2" to 24" 3.Welded: 24" to 60" 4.Wall Thickness: 2.0-120mm 5.Standard: ANSI/ASME API DIN MSS JIS ISO BS GB etc. 6.Material: Carbon steel, alloy steel, stainless steel etc. 7.Surface treatment: Transparent oil, rust-proof oil, hot galvanizing 8.Special design available