21 Series Medium-Duty Caster – 4″ (101.6 mm), 300 lbs. (136 kg.), Thermoplastic Rubber, Rigid, Steel, 2″ (50.8 mm), 2-5/8″ x 3-5/8″ (67 mm x 92 mm) – 3″ x 3″ (76 mm x 76 mm), 3/8″ (9.52 mm), 4″ x 4-1/2″ (102 mm x 114 mm)
21 Series Medium-Duty Caster – 4″ (101.6 mm), 300 lbs. (136 kg.), Thermoplastic Rubber, Swivel, Steel, 2″ (50.8 mm), 2-5/8″ x 3-5/8″ (67 mm x 92 mm) – 3″ x 3″ (76 mm x 76 mm), 3/8″ (9.52 mm), 4″ x 4-1/2″ (102 mm x 114 mm)
21 Series Medium-Duty Caster – 4″ (101.6 mm), 500 lbs. (227 kg.), Polypropylene, Rigid, Steel, 2″ (50.8 mm), 2-5/8″ x 3-5/8″ (67 mm x 92 mm) – 3″ x 3″ (76 mm x 76 mm), 3/8″ (9.52 mm), 4″ x 4-1/2″ (102 mm x 114 mm)
21 Series Medium-Duty Caster – 4″ (101.6 mm), 500 lbs. (227 kg.), Polypropylene, Swivel, Steel, 2″ (50.8 mm), 2-5/8″ x 3-5/8″ (67 mm x 92 mm) – 3″ x 3″ (76 mm x 76 mm), 3/8″ (9.52 mm), 4″ x 4-1/2″ (102 mm x 114 mm)
21 Series Medium-Duty Caster – 4″ (101.6 mm), 700 lbs. (317 kg.), Urethane, Rigid, Steel, 2″ (50.8 mm), 2-5/8″ x 3-5/8″ (67 mm x 92 mm) – 3″ x 3″ (76 mm x 76 mm), 3/8″ (9.52 mm), 4″ x 4-1/2″ (102 mm x 114 mm)
21 Series Medium-Duty Caster – 4″ (101.6 mm), 700 lbs. (317 kg.), Urethane, Swivel, Steel, 2″ (50.8 mm), 2-5/8″ x 3-5/8″ (67 mm x 92 mm) – 3″ x 3″ (76 mm x 76 mm), 3/8″ (9.52 mm), 4″ x 4-1/2″ (102 mm x 114 mm)
21 Series Medium-Duty Caster – 5″ (127 mm), 350 lbs. (158.8 kg.), Thermoplastic Rubber, Rigid, Steel, 2″ (50.8 mm), 2-5/8″ x 3-5/8″ (67 mm x 92 mm) – 3″ x 3″ (76 mm x 76 mm), 3/8″ (9.52 mm), 4″ x 4-1/2″ (102 mm x 114 mm)
21 Series Medium-Duty Caster – 5″ (127 mm), 350 lbs. (158.8 kg.), Thermoplastic Rubber, Swivel, Steel, 2″ (50.8 mm), 2-5/8″ x 3-5/8″ (67 mm x 92 mm) – 3″ x 3″ (76 mm x 76 mm), 3/8″ (9.52 mm), 4″ x 4-1/2″ (102 mm x 114 mm)