Flat-Free Polyurethane Foam Wheel, 150 lb Load Rating, Sawtooth Tread, 8 in Wheel Dia., 1 3/4 in Wheel Width, For Axle Size 1/2 in, 8 x 2 in, Standard Tire Rim Type, Center Mount Hub Position, 2 3/8 in Hub Length, Steel Hub Material, Yes Non-Marking