24″ roller bars i.e. scroll rods. These are beefy and stronger than any I know at 3/4″ diameter. They can work on side bars other than the NS4 scroll frame attachment however it may be necessary to drill the holes of the side bars to fit the screw ends through.
Listing is for 2 rods only. Any mention in title or description of the numeral 4 refers solely to the manufacturer and not quantity to be received.