TRIPP LITE's SRSHELF4PSL SmartRack is a standard sliding shelf for installation in rack cabinets. The SRSHELF4PSL has a 28.3 in / 72 cm depth (29.5 in / 74.9 cm including handle) and can support up to 50 lb. This fully extendable shelf can accommodate 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 / 71 cm minimum and 46 in / 117 cm maximum.