1. lt gt BLACK BOX NETWORK SERVICES 2010 All rights reserved Black Box Corporation FEATURES Support up to 150 pounds Easy installation no tools required For use on standard 19 inch rails with square M6 holes Two sizes to accommodate most cabinet depths Adjust to fit your cabinet so there s no empty space at the back for your equipment to fall through Cable slots and pre punched D ring holes Vented for air circulation M M Tool less Telescoping Shelves 23 6 35 4 D RM047 35 4 47 2 D RM049 D 724 746 5500 blackbox com lt gt BLACK BOX NETWORK SERVICES