All steel bed riser. Made of two parts: base and top cup. Top cup is 3 inches in diameter. The base diameter is 5-3/4 inches in diameter. The lift height is 5 inches or 6 inches. Available in black, white and brushed. They can be painted over easily. These are single bed riser on sale. Customers need to order many, 1 for each leg and glide (middle leg) to raise a bed evenly.