Up for sale is
one fence guide rail
3/8-18 Special Screw W/Spacer for a Delta Rockwell Contractor's table saw. Many of the Delta Rockwell contractor saws utilize 3/8-24 (24 threads/inch) guide rail screws, verify the thread pattern on yours before ordering.
Sale is for one screw and one spacer.
The 44" fence guide rails (1-3/8" in diameter) are seen in photos, those aren't included.