PRODUCT SIZE: 4U, W 19.29" x H 7.48" x D 12"; The rear mounting holes are 18" center to center for mounting onto a wall. Compatible with Most 19" Rack Mountable Equipments, such as Shallow server and IT equipment, Network Switches, Patch panels. NEW STRUCTURE: Besides foldable as other brackets, this 12 Deep Shallow Server and IT Equipment is with top cover like an open wall mount cabinet for dustproof and holding small objects on the top.