These 4 way Racks are made up of either Rectangular Blade or Square Tube Arms and Uprights. Rectangular blades measure ½ W x 1 ½ high, square tubes measure ¾ square. Each arm is independently adjustable every 3" from 48" to 72". Add casters if you would like a movable rack. All have swedge fitting for sign card holders. Assembly Instructions for 42809 and 428410.