Fits 4 Post, 2 Post cabinets - Adjusts the rack installation depth - Round holes convert to square holes - Kit includes 2 of each bracket (10 total) - Weight capacity rated at 50 lbs per rack unit Rackmount adapters for Dell 2U servers - Supports Dell RapidRail slides - Compatible with cable managment arm - Solution to rack frame obstructions - Compatible with Dell PowerEdge 8450, 2850, 2650, 2550, 2450 - Compatible with Dell PowerVault 122T, 132T, 220, 221, 224F, 660F The Adapter Kits provide a solution to the common problems associated with installing rackmount servers in many different server racks. These adapter kits allow for considerable adjustment in the installation depth of the server rack. If the server rack is too deep or too shallow, these adapter kits will solve the problem. If your server rack has round holes and your slide rails require square holes, these kits will convert round holes to square holes.