4pc Caster Kit for Open Frame Rack - 4POSTRACK
By StarTech.com

If you prefer mobility for your 4POSTRACKBK open rack solution, pick up the StarTech.com 4POSTCASTER. This set of four casters connects to the bottom of your 4POSTRACKBK and allows you to move and adjust the position of your rack to suit your needs. ... 

1U RM Chassis - 24 Channels Wide *Modules NOT Included*
By APC

Protection against powers spikes traveling through data lines ensures complete protection of your equipment from surges. It is very important to protect your equipment from "back door" surges traveling through data lines, as they can be as damaging to your equipment as surges traveling over power lines. ... 

SmartRack Installation Kit for UPS Up to 250lbs
By Tripp Lite

Tripp Lite's 4POSTRAILKIT adjustable rackmount shelf system supports heavy UPS systems in 4 post rackmount applications. Two included pairs of expandable "L bracket" mounting rails offer front to rear support rackmount UPS systems. Pair of expandable "L brackets" adjust to any setting between 20.5 and 36 inches. ...