I bought 2 4ft lengths from Ace Hardware Outlet and they still shipped cheaper than local stores. I'm adding a second garage door to an oversized garage so I needed something to secure the ends of the tracks. It's probably a bit overkill 9. You could use something smaller like 1" x 1", but my door is solid steel, which is heavy, and there are also two 110-pound springs that attach to the brackets are. I chose the 4ft length to save on shipping as I could split each into 3 pieces of 12", 20" and 16" to make a nice triangular mount. Definitely 5 stars for this and any other length would be better.the same rating.