This item is for 1pc X stainless steel elbow
1PC 19-89MM 90 Degree Pipe 304 Stainless Steel Elbow  Fittings Exhaust Polished 

Bend Degree: 90°

Material: 304 stainless steel

Wall Thickness: approx 2mm

Outer Diameter(OD):

19mm/0.75 inch , 25mm/1 inch , 32mm/1.25 inch, 38mm/1.5 inch, 45mm/1.77 inch 51mm/2 inch , 57mm/2.25 inch , 63mm/2.5 inch , 76mm/3 inch , 89mm/3.5 inch

Please allow 0-1mm discrepancy due to different measurement method.