The 4POSTRACK12 12U Adjustable 4 Post Server Equipment Open Frame Rack Cabinet provides a durable open air housing for rackmount servers & networking equipment. The equipment rack/cabinet features heavy gauge mounting rails to ensure a stable installation platform & adjustable posts for flexible installation. The 12U open frame rack is compliant with EIA-RS-310C standards offering a universal design that's compatible with equipment from popular manufacturers. Plus the equipment rack is flat-packed reducing shipping costs & simplifying handling & assembly. For added versatility Star Tech.com offers an optional 4pc Caster Kit (4POSTCASTER) that can be installed on the bottom of the 12U server rack making it easier to re-position the cabinet/rack as needed for future uses. Backed by a Star Tech.com lifetime warranty & free lifetime technical support The Star Tech.com Advantage Heavy duty pre-drilled base allows a user to bolt down the rack for situations where heavy equipment might otherwise tip over Open frame design lets you easily route manage & access your equipment cables without any obstruction Flat pack packaging for easy shipping to any location.