RKCASTER2 - StarTech.com Heavy Duty Casters for Server Racks/Cabinets, Set of 4 Universal M6 2-inch Swivel Caster Kit, 45x75mm Pattern, Replacement Caster Wheels for 4 Post Racks, Steel/Plastic

4-Pack Rolling Caster Kit (RKCASTER2) - Rack casters kit - black, silver