Each rod is 1/2" diameter and contains 1/8 IPS threaded ends. The rods are sold in lengths of 2", 4", 6", and 12", and screw together seamlessly to form longer sections.
To determine overall hanging height, add the length of the rod(s) purchased to the maximum height shown on each fixture. For example, adding a 6" rod to fixture with an overall hanging height of 36" will make the fixture hang at 42", or adding a 12" will make the fixture hang at 48", and so on.
Contact us if you have any questions about hanging height.