Nexel Polyurethane Wheel Swivel Casters ● Add these high quality casters to your unit and make it a mobile unit ● 1200 lb. capacity per set ● Includes four 5" diameter polyurethane wheel swivel casters with 4 protective bumpers ● Color: Gray ● Nexel's casters can be attached to any of its Shelving Units ● Limited 1 Year Warranty ● Nexel offers a wide range of shelving units and parts in many different finishes and sizes. Also offers several accessories (ledges, hooks, dividers, baskets, etc.), which can be purchased separately and extend the usefulness of your shelving unit ● Photos may not reflect advertised size.