NavePoint Full Depth Rack Mount Shelf Rail for Dell IBM HP Compaq 2-Pack These rack mount adjustable rails kits allow you to support devices on your 19", 23" or 30" rack without having to mount them directly. Full, nested floor allows weight to be distributed in front and back. Depth can be adjusted up to 33.25" deep. Support up to 110 lbs when properly 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.