I used seamless 316 stainless steel tubing that was .375" diameter with a .028" wall thickness and its 20 inches long.
You can purchase the tubing at http://www.onlinemetals.com/
Also Pro-Tec sells the same tubing for their trim system for $14.95
You can purchase the tubing at http://www.onlinemetals.com/
Also Pro-Tec sells the same tubing for their trim system for $14.95