Casters, BT,NT,NC,BC,BP,FC,type 1-1/2"--2" Heavy duty Industrial Caster: 4"- ... Rubber Wheel, 6 Casters, BT,NT,NC,BC,BP,FC,type 1-1/2"--2" Heavy duty Industrial Caster: 4"-8 ... Duty Industrial Caster Series AA: Medium-Loading Rubber A Type Industrial Caster Series:4.0mm,4"--8" BB:Medium ... Caster(Roller Bearing)(8.0mm),4"--8" BB: B-type Blue-Bracket Polyester Cast-Iron Industrial Caster(Roller/Ball Bearing ...