The CyberPower 4POSTRAIL 4 post rack mount rail kit provides a universal mounting solution for 1U, 2U, and 3U equipment weighing up to 231 pounds. The adjustable rails can be expanded from 18.5" to 29" to support various sizing requirements.  The necessary attachment hardware is included. A Limited 5-Year Warranty ensures that this product has passed our highest quality standards in design, assembly, and material or workmanship.