DELL XR11/XR12 COMPATIBILITY: Sliding rail kit designed as an alternative to Dell ReadyRails for PowerEdge XR11 and XR12 servers 2POST AND 4POST MOUNTING: Fits 4Post racks with 17.5”-30.5” (444.5-774.7 mm) depth and 2Post center mount racks with 3”-6” (76.2-152.4 mm) depth UNIVERSAL RACK FIT: Supports square round and threaded holes; works with L C and ? upright rack shapes EASY MAINTENANCE ACCESS: Sliding rails provide smooth extension for hassle-free maintenance and equipment removal DURABLE DRY SLIDE DESIGN: Built to last longer than ball-bearing rails ensuring long-term reliable performance The RackSolutions 2U Cobra 130-A Rail is a durable and versatile sliding rail solution, serving as an alternative to Dell ReadyRails for Dell PowerEdge XR11 and XR12 servers. Compatible with both 2Post and 4Post racks that meet EIA-310 19” standards, these rails provide a mounting depth of 17.5” to 30.5” for 4Post setups and 3” to 6” for 2Post center-mounted configurations. Designed to support square, round, and threaded holes, the rails accommodate L, C, and ? upright rack shapes. Engineered with high-quality dry slide construction, these rails extend equipment smoothly for easy maintenance and removal, lasting longer than traditional ball-bearing kits. The RackSolutions Cobra 130-A Rail is the ideal choice for IT professionals looking for a reliable, flexible, and easy-to-install rack rail solution for Dell XR11 and XR12 servers.