Tripp lites smartrack srshelf4psl is a standard sliding shelf for installation in rack cabinets the srshelf4psl has a 285 in 724cm depth 295 in 749cm including handle and can support up to 50lbs this fully extendible shelf can accomodate tower units monitors and other equipment it is designed for 4 post rack mounting and the required mounting hardware is included expandable mounting rails supports installation in racks with front to rear rail distances between 28 in 71cm min