Tripp Lite's SmartRack SRCASTER is a heavy duty rolling caster kit used to maneuver rack enclosures, wall-mounts and 4 post open frame racks to their desired location. The kit includes 4 casters (heavy duty 550 lb per caster rating), installation guide and mounting hardware. The kit comes standard with all floor standing rack enclosures (48/45/42/25/12U). Note: Casters are intended for minor position adjustments and are not designed for moving racks over long distances. Can be purchased as an accessory to turn stationary 4-post open frame and wall-mount racks into mobile rolling racks Included with all floor-standing rack enclosure models (48/45/42/25/12U) Includes 4 casters, installation guide and mounting hardware Per caster rating of 550lbs . . Package Contents : SRCASTER Caster Kit Installation Guide Mounting Hardware Product Type : Caster Load Capacity : 249.48 kg Application/Usage : Enclosure Manufacturer : Tripp Lite by Eaton Product Model : SRCASTER Features : Heavy Duty Compatibility : Tripp Lite SR4POST SmartRack Enclosure Open Frame Rack System Limited Warranty : 5 Year Packaged Quantity : 4 / Kit Manufacturer Website Address : https://tripplite.eaton.com/