With a range of front to rear mounting adjustment from 19 1/2" to 25" deep, the versatile AS3-22 shelf rackmounts most video decks. Knock-down for freight and space economy, this 5 1/4" (3 space) video shelf supports 500 lbs. Shelf surface is 22 1/4" deep. Note: Fits in racks with a minimum 25" overall depth