Shelf Standards/Mounts/Rails, Set of 4 each 5 ft long, for single slot brackets

Description

Shelf Standards or Mounts or Rails, Set of 4, adjustable, each 5 feet long.  I have seen these variously called standards, mounts, and rails.  It may depend on the maker, and there is no imprint of a maker on these.  These metal items were last painted green, and they still have green paint on them, and also a little rust in places, especially on the back side.  They are vintage, as you hardly ever see these for sale in 5 foot lengths.  Most of the ones for sale on E-bay are in 2 foot lengths.  They will support single slotted shelf brackets of about any length, although the most commonly used are single slotted support brackets for 5 to 9 inch width shelves.  I will include 24 wood screws of 1 and 1/4 inch length each (used), but your particular installation may require something different.  There are lots of shelf brackets for sale on E-Bay but very few of these standards (mounts) (rails).