We can supply Brass hollow Rods in Multiple Diameters, Wall Thickness, lengths, and Finishes.   

1) Diameters available :  3/8" ,  1/2" , 5/8" , 3/4" , 1" , 1 1/4" , 1 1/2" and 2"

Lengths available :  6'-0" and 12'-0"   We cannot ship larger then 7'-9" in an 8 foot package which requires additional shipping costs

We can cut these to sizes as per your measurements upto an 1/8" accuracy with laser cuter.  

If you can provide us with CUT CLEAR sizes needed we can do a wastage analysis and build the cart for you

We can also factor in the flange and/or brackets you would like to use to provide accurate sizes.  

We have a Tubing Connector, Splice which can be used on site to connect tubings to make them longer.

2) Thickness available:  0.040 mm (1/24") (standard),  0.050 mm (13/64") (standard) , 0.062 mm (1 /16") (thicker) , and 0.125 mm ( 1/8") (thickest)

3) Finishes:  Custom Matched, Polished Brass, Polished Chrome, Polished Nickel, Satin Brass, Satin Nickel, Antique Brass, Oil Rubbed Bronze, Aged Brass, Un-Lacquered Polished Brass, Black Painted un-lacquered, and Dual Tone Finishes

Most People use 1 1/4" Diameter Rods for their Closets Rods, these work best for standard clothes hangers.  1" or 1 1/2" diameter work fine as well.  

Picking the right Diameter and Wall Thickness has to do with the span of the opening, brackets used for mounting, mounting of the hardware to the wall, weight of clothes expected, is some sagging acceptable, and the desired look you are trying to achieve.  

4) Guideline recommendations for 1 1/4" D Tubing's, Your designer and contractor should make decisions per the project requirements.  

1)  0.040 MM and 0.050 Standard rods should be supported at every 2 to 2 1/2 feet by center brackets

2)  0.062 MM Thicker rods should be supported at every 3 to 3 1/2 feet by center brackets

3)  0.125 MM Standard rods should be supported at every 4 1/2 to 5 feet by center brackets