1/4" IPS, 3/8" IPS, and 1/2" IPS Stems are 16 gauge steel tubing and threaded 3/4" at each end. 1/8" IPS Stems are 18 gauge steel tubing. Stock finish is a white powder coat finish. (black and raw also available) Internal Diameter threading is now available on 1/4" IPS (1/8" IP thread) & 3/8" IPS (1/4" IP thread) steel tubing.