RackSolutions' 2U Cobra 115-A Dry Slide Rail provides a sliding alternative to Dell ReadyRails, designed for compatibility with Dell PowerEdge servers from generations 11-15, including models like R7515, R720XD, R820, and more. These dry slide rails are engineered for easy serviceability, allowing smooth extension of equipment without the need for an OEM rail kit. Compatible with both 2-post and 4-post racks, the rails feature adjustable mounting depths of 12" to 32" for 4-post racks and 3" to 6" for 2-post racks. Ideal for threaded, round, or square holes, this rail kit offers a robust, long-lasting solution for managing your Dell servers in any standard EIA-310 rack.