... ,robustness,anti-corrosive 2,sturdy and durable,easy to clean 1) Ball-joint rail have advantages such as attractive appearance, convenient installation ... .3(51.0)33.5(38.1)economy66(70)42.3(38.1)33.5(38.1)26.8(32.0)2) Carbon ... rail manufactured according to design, double rail is 1,100mm, and triple rail is 1,200 mm.4) Column spacing: mainly four ...