1-5/8" x .055 x 21' Black Light Commercial Pipe for Chain Link FencesThis is a 1 5 8" O. D. by . 055" thick by 21' long black residential pipe. This particular pipe is usually used as a thinner, cheaper, alternative option of top rail for commercial chain link fences. If you want to cut these down and use them as posts, this thickness of pipe is not meant to be driven. Due to its length, this can only be shipped via flatbed. 1 5 8" nominal & actual O. D. . 055" wall thickness 17 gauge Galvanized, Black powder coated