Store your servers network and telecommunications equipment in an adjustable 12u open frame rack the 4postrack12u 12u server rack lets you store your servers network and telecommunications equipment in a sturdy adjustable depth open frame rack designed with ease of use in mind this 12u rack offers easy to read markings for both rack units u and depth with a wide range of mounting depth adjustments 22 40in that make it easy to adapt the rack to fit your equipment this durable