Quoted as Internal Diameter. It slots over displayed Outside Diameter tube sizes.

Price is quoted per single Reducer.

304 Stainless Steel Tube & Pipe Reducer. 

Stainless steel tube section;

100mm Long.

One end 3" 76.2mm Internal Diameter - Other end is 3.5" 88.9mm Internal Diameter.

Used for connecting 3" 76.2mm Outside Diameter pipe to 3.5" 88.9mm Outside Diameter. 

Ideal as a weld on part; or can be clamped on once slotted.