Nexel Ball Series Chair Caster ● Set Of 5 ● 2" Diameter Plastic Hooded Ball ● Increases chair height 2½" ● Nexel offers a wide range products such as shelving units and parts in many different finishes and sizes. Also offers several accessories (baskets, hooks, ledges, etc.), which can be purchased separately and extend the usefulness of your shelving unit ● Photos may not reflect advertised size.