Add mobility to your desk with these sturdy, industrial grade casters. They replace the levelers on all desks except Exo, Level4 and electric Maxo/Multi/Pro desks. Casters are 3” diameter, with dual rubber tires, 75lb per caster loading, and are retro-fittable. Price per set of four, 2 locking and 2 standard. Casters will add 3" to both lowest and highest levels of desk adjustment. Not recommended for Level2 desk unless Biomorph Adjustable Keyboard Surface is ordered along with it.