Caster Wheel 400 lb Load Rating 300 to 999 lb Load Rating Range 4 in Wheel Dia 1 1/4 in Wheel Width Polyurethane Wheel/Tread Material Hard 63(+/-5) Shore D Roller Standard Tread Shape 3/8 in For Axle Size Not Included Includes Spanner Bushing Polymer Wheel Core Material No Non-Marking 1 1/2 in Hub Length