... type 1-1/2"--2" Heavy duty Industrial Caster: 4"-8" Rubber Wheel, 6 Casters, BT,NT,NC,BC,BP ... "--2" Heavy duty Industrial Caster: 4"-8" Rubber Wheel, 6" 8" Reinforced Industrial Caster Series AA: PPR Reinforced Industrial Caster(3.0mm) Ball ... Bearing:3", 4", 5" BB: Polyester PU Reinforced Industrial Caster ...