This locking swivel wheel caster is a direct replacement. The caster has a 1/2" x 3/4” stem for the Crate base and 1/2” x 1 1/2” stem fits into the holes on the bottom rail of the trolley. The retaining nut should be tightened firmly with a 3/4" wrench, assembly instructions are included and are available online. The casters are not interchangeable between trolleys and crates.
