Make your MeshWorks mobile with our industrial strength Locking Casters Set. Compatible with the MeshWorks Bookshelf, 5 Tier Tower, 5 Tier Shelving Unit, Narrow Shelving Unit and Utility Unit. Sold as a boxed set of 4 containing 2 wheels with locking mechanisms and 2 without. Weight limit for shelving units on wheels is 330 lbs. Overall Dimensions: 2-3/4″ L x 2-3/4″ W x 3-3/4″ H