... Bearing:3", 4", 5" BB: Polyester PU Reinforced Industrial Caster (Roller Bearing): 3", 4", 5" Mediu- ... Brake Caster Series AA:Eagle-Bracket Rubber Cast-Iron Industrial Caster(Roller Bearing) (6.0mm), 6",8 ... type Blue-Bracket Polyester Cast-Iron Industrial Caster(Roller/Ball Bearing) (10.mm)4"-12" CC:B-type ... Blue-Bracket Polyester Cast-Iron double brake Industrial Caster(Ball ...