For some reason the mounting rails must be spaced at 23 1/2 inches, which is a really odd measurement and there are NO INSTRUCTIONS that I could find that specified that distance. I hung my bars at 24 and only 1/2 of each bracket fit into the track.

The instructions on the back of the hardware package suggests bars at every 16"

Also there is a very small screw metal thread that holds the brackets to the frame and they can easily be stripped if tightened to much. A machine screw w/ an nut would be much more sturdy. I am sure the drawer will come off the frame at some point in the future.