We at Divine Metal & Alloys 321 Stainless Steel Pipe is available in a variety of shapes, sizes, grades, and finishes. The most common shapes are round tubes and pipes. The grades vary depending on your application; some grades are better suited for certain tasks than others. Some common grades include 304L, 316L, 310S, 317L, 316Ti, 347H, 904L, etc. The finish will depend on the usage as well; some finishes may be better suited for resistance against rust or chemicals while other finishes may be better suited for aesthetic purposes.