This is for one carton of hangers only. The small springs that slide down over top post of hanger are included (one per hanger). Document hanging clamps are not included.
This is for one carton of 12 replacement hangers. These work with Mayline Clamps 93316, 93326, 93336, 93346, and 93356, which are sold separately.
Most hanging files centers and stands come with hangers included. You do not need these if you are buying an entire blueprint rack or stand. These hangers are usually purchased when your rack or stand has had the hangers become bent or missing.