The Eaton Tripp Lite Series 4-Post Rack-Mount Installation Kit is an essential accessory for mounting UPS systems in 4-post rack applications. This adjustable kit accommodates various settings between 20.5 and 36 inches, making it versatile for different rack configurations. It includes a pair of expandable 'L bracket' mounting rails that provide robust front-to-rear support for rackmount UPS systems. The kit comes with square hole rack attachment hardware and temporary placement pegs, allowing for easy single-person installation. With a maximum capacity of 250 lbs, this mounting kit is perfect for heavy UPS systems, ensuring stability and reliability in your setup.