General Purpose Friction-Ring Stem Caster, Swivel Caster, 300 lb Load Rating, 300 to 999 lb, 4 in Wheel Dia., 1 1/4 in Wheel Width, Rubber Wheel/Tread Material, 5 in Mounting Height, Precision Ball, 7/16 in x 1-7/16 in Caster Stem Size, Friction Ring, Steel Caster Frame Material, Zinc Plated Frame Finish, Yes Non-Marking, 1 Number of Wheels