32 SERIES (Medium/Heavy Duty Front Lock Casters) This series caster positive locking system brakes wheel and swivel base simultaneously with easy engage/disengage pedal. Double ball raceway heat treated for long wear and added strength, top plate and yoke 1/4in, cold forged steel, 5/8in bolted kingpin, 1/2in axle bolt with locknut, 3/4in roller bearing with hardened spanner bushing with hole and grease groove, grease fitting on swivel raceway. Character: wheel diameter(in): 4, 5, 6, 8 wheel width(in): 2 Wheel material option: PU on cast iron, PU on Aluminum core, PU on PP core, TPR on PP core, RUBBER on cast iron core, Rubber on Aluminum core, Phenolic wheel, Cast iron wheel, V-groove wheel, Ductile wheel, V-Groove Ductile wheel, Bearing option: 1. Roller Bearing, 2. Ball bearing Fitting option: 1. top plate BRAKE TYPE: 1. total brake