This depth adapter kit lets you extend or reduce the mounting depth of one rack unit (1U) in your server rack by up to four inches. If you're using the adapter kit in a two post installation the extenders can support a total weight load of 10 lbs. (4.5 kg). If you're using the adapter kit in a four post installation, the extenders can support a total weight load of 90 lbs. (40 kg), you can even use two sets of extender brackets in a four post installation and achieve the same weight capacity performance. You can use this adapter kit to mount equipment in your server rack that's up to four inches longer or shorter than the rack's mounting depth. With this adapter kit, you can customize your server rack to support different mounting depths, so you have the freedom to mount equipment of different depths in the same rack. It's a cost-saving, hassle-free way to consolidate your equipment into a single rack, so you have one server rack to manage instead of two. The depth adapter kit can also be used to help manage cables. You can mount equipment 4' in from the rails, to prevent cables from protruding from the rack. You can use the rail depth adapter to mount equipment that has high density cabling, such as patch panels, PDUs or network switches, to minimize the effects of cable strain and provide easier access to the cables.