This wall-mount rack provides 4U of space for mounting your servers or A/V equipment to a wall. The rack has a built-in shelf that you can install at either the top or bottom of the rack, to create a sturdy surface for storing equipment that s not rack-mountable. Customize your setup The wall-mount bracket features a dual-position 12 in. shelf, that depending which way you mount the rack, can be positioned at either the top or the bottom. This shelf gives you a stable surface for placing equipment that s not rack-mountable or storing your tools. Because the shelf can be positioned at either the top or the bottom of your rack, it gives you the freedom to customize your workspace depending on height or applications. The rack also has adjustable mounting depth from 12 in. to 18 in. enabling you to define the depth that exactly fits your equipment, plus any space you d like to have for cabling, ensuring that the rack does not take up any more space than it has to. Make the most of your available space The 4U rack optimizes your working space by mounting equipment to your wall instead of taking up desk or floor space -- perfect for your So Ho (small office, home office) environment, server room or any other location with limited space available. Ensure a secure and hassle-free installation The wall rack is constructed of solid steel to ensure a sturdy and safe mounting solution for your mission-critical equipment. Plus, because the wall mounting holes are positioned 16\" apart, it exactly matches standard drywall construction framework, to ensure simple and secure wall-stud anchoring. For hassle-free equipment installation, the rack features 10-32 tapped rails, so you can mount your equipment directly to the rail and avoid the hassle of using cage nuts. To make equipment installation and maintenance even easier, the wall-mount rack also features a rear opening for cable access and tie-off points for built-in cable management.