4 x 1 inch. Caster Wheel Pack with Brake for R2 and R6 Carts for Rock-N-Roller C

Rock N Roller RCSTR4X1 4" x 1" Caster with Brake (2-Pack)

Rock-N-Roller Caster with Brake 4" x 1" 2-Pack for R2 & R6 Multi-Carts Black

Rock-N-Roller RCSTR4X1Glider Caster with B2-Pack for R14G & R16RT Multi-Carts

Gator Cargo Case with Wheels, Retractable Handle (GX-20)

Rock N Roller Multi-Cart 8x2" R-Trac Caster with Brake for R12 Cart, 2 Pack

Rock N Roller Multi-Cart MultiCart Quick Set Shelf for R8, R10, R11G, and R12 Ca

Rock N Roller Multi-Cart MultiCart R18RT 8-in-1 Ground Glider Mega Equipment Car