Check the listing for details. Tripp Lite 4-Post Rack-Mount Shelf Kit Universal (4POSTRAILKITWM), Silver. Condition: New. Listed at 104.15 USD. Tripp Lite 4-Post Rack-Mount Shelf Kit Universal for Wallmount Racks 1U 1U RACK SHELF KIT: Rack rail kit adds 2 adjustable shelves to the mounting rails of a 19 in. 4-post wall-mount enclosure to support heavy UPS systems and other pieces of equipment.SHELF CAPABILITY: Rack mount shelf is compatible with 19 in. wall-mount open frame racks and enclosures. This adjustable rack shelf is compatible with mounting depths of 14.5–23.5 inches.HEAVY-DUTY CONSTRUCTION: Wall mount rack shelf offers cold-rolled steel construction with powder-coated finish designed for long life. 1U rack rail kit with maximum load capacity of 150 lb.VERSATILE MOUNTING OPTIONS: Mounting hardware included for quick installation in square-hole rack. Threaded-hole rack installation supported with user-supplied hardware.5 YEAR WARRANTY: Backed by a five year limited time warranty.