Wheel material: Polyurethane (PU) tread + plastic wheel core, PU Screw Movable Double Brake Casters with wear resistance, chemical resistance, high strength, high elasticity, low pressure resistance, shock absorption, tear resistance, radiation resistance, high load bearing and Good performance such as shock absorption buffer. Suitable for medical industry, electrical equipment industry, Caster Wheel Wrench, trolley industry, furniture industry, toolbox, etc. Tread hardness: 90 (±5) Shore A Temperature range: - 40 / + 80 °C" Caster Wheel With Stud Wheel diameter: 2"-5" Load: 27-60kg Screw rod double brake casters, pressed wheel frame, galvanized, ball bearing Wheel Material: PU caster with PP core Housing made of pressed steel, Zinc plating Housing: Swivel threaded stem caster with total brake