VERSATILE COMPATIBILITY: Fits PowerEdge 11th Gen Dell Precision and Dell PowerVault servers; works with both 1U and 2U server configurations DURABLE DRY SLIDE RAILS: Long-lasting dry slide mechanism provides smoother operation and greater durability compared to ball-bearing rails EASY SERVICEABILITY: Rails slide out of the rack for convenient access and maintenance enhancing serviceability ADJUSTABLE MOUNTING DEPTH: Accommodates various rack sizes with adjustable mounting depths'3.0' - 6.0' for 2-post racks and 20.0' - 32.0' for 4-post racks FLEXIBLE FIT: Compatible with L C and ? rack upright shapes and universal square round and threaded hole racks; includes shim for a custom fit