€¢ Put some movement under those hard-to-push-around appliances! €¢ Split 4-wheel design for easy steering €¢ Easy alignment & height adjustment €¢ Load capacity: 250 lb; each roller piece €¢ Not recommended for cushioned vinyl floors or hardwood floors €¢ Stem size: 5/16 inch Dia - 18 threads per inch; 7/8 inch L €¢ Mounting height is 1 3/8 to 1 3/4 inch €¢ Rust resistant €¢ 4 Units per box >> The Shepherd 7/8 inch Appliance Casters easily move refrigerators; and other heavy appliances with a weight load of 250 lb. These casters are not recommended for use on cushioned vinyl floors."