Caster Wheel, 140 lb Load Rating, 0 to 299 lb Load Rating Range, 4 in Wheel Dia., 1 in Wheel Width, Polyolefin Wheel/Tread Material, Hard, 70 Shore D, Not Applicable, Standard Tread Shape, 5/16 in For Axle Size, Not Included Includes Spanner Bushing, Polyolefin Wheel Core Material, No Non-Marking, 1 1/8 in Hub Length