4 Post Adjustable Rack Rails - 19" or 23" Left Adjustable Rail System - (From 20.25" to 33.25" Depth) Right Adjustable Rail System - (From 20.25" to 33.25" Depth) Mounting Hardware Kit - 8) 10-32 1/4" - 8) 12-24 5/8" - 8) 10-32 5/8" 200lb Load Rating 2.5" Ledge to Support a Variety of Equipment