NavePoint Universal 1U Rack Mount 4-Post Shelf Rail - 33.5" deep 3-Pack These rack mount adjustable rails kits allow you to support devices on your rack withough having to mount them directly. Can be mounted on any rack or cabint including 19", 23", 30". Depth can be adjusted up to 33.25" deep. Support up to 110 lbs when installed to a 4 post rack or cabinet. Both 10-32 and 12-24 mounting screw kits are included allowing mount on either thread pattern.