... 4", 5" BB: Polyester PU Reinforced Industrial Caster (Roller Bearing): 3", 4", 5" Mediu-Loading Heavy Duty ... Series AA:Heavy-duty Rubber Cast-Iron Industrial Caster(Roller Bearing)(6.0mm),4"--8" BB: Heavy- ... Series AA:Eagle-Bracket Rubber Cast-Iron Industrial Caster(Roller Bearing) (6.0mm), 6",8" BB: Eagle ... 250,300,350,400,450,500,550,600 Special drawer slide: thinckness 1.0-1.2mm; 250,300,350, ...