All Tracks Overhead bridge systems are handmade to your specs. in my home shop.  All hangers are included for your type of ceiling, may be extra for extra long rods.  The bridges are made from 3/8" sq. steel tubing and are welded together, and are powder coated Satin black.   They measure 3" bottom to top of rail and are 6 1/4" wide, lengths to 48".  Curves are the same dimensions and take 72" track.  We use Atlas Track in 2 and 3 rail.