Caster Wheel, 1,000 lb Load Rating, 300 to 999 lb Load Rating Range, 4 in Wheel Dia., 2 in Wheel Width, Iron Wheel/Tread Material, Extra Hard, Brinell 145, Roller, Standard Tread Shape, 3/4 in For Axle Size, Included Includes Spanner Bushing, Cast Iron Wheel Core Material, Yes Non-Marking, 2 3/16 in Hub Length