A 2-pack of replacement casters with brake for Rock-n-Roller cart models R2 and R6.
Rock N Roller RCSTR4X1 4" G-Force Casters with Brake Features
4" x 1" yellow caster with brake. Polymer hub bonded to soft TPR tread
Sold as a set of 2 caster wheels with nuts and lock washers
Caster stem is 1.5" x .5" with 13 threads per inch