Annealed 304 Stainless Steel Tubing, 36 in. Length, 3/8 in. O.D., .028 in. Wall Thickness.; ANNEALED 304 Stainless Steel Tubing sold on straight lengths only. Ideal for precision hard line systems, and can be polished for a custom look. Easy to form in single or double flare (double flare requires high quality forming tool).;.