The Wells 21947 Caster Kit includes a set of four durable casters, designed to enhance mobility and stability for your equipment. Two of the casters feature front brakes for added control, ensuring secure positioning when needed. This kit raises your unit by a nominal height of 3-1/2 inches, making it compatible with RWHD-1, RWHD-2, and RWHD-3 models. Ideal for improving maneuverability and accessibility in various settings.