Allows Individual To Turn Up To 360o Makes Getting On Or Off A Seat Or Chair Easy And Comfortable - Car Seats Too! Durable And Stable With An 300 Lb. Weight Capacity Portable: Weighs Only 3 1/4 Lbs. Diameter: 15 5/8 1 Year Limited Warranty Shipping Carton Size: 18 L X 17 W X 5 H