Ideal for moving an assembled Piano this Triangular Dolly is a cast iron base 12" end to end with a 2" deep well, measuring 6-3/4" at the top and 5-1/4" at the bottom. Clearance is 1-1/4" from the floor. Overall height is 4-1/4". The 3" diameter wheels are chosen based on the weight carried and the environmental needs. The high grade hard rubber tread wheels are used for providing maximum floor protection; made from natural hard rubber with self-lubricating bushed bore. This wheel provides a weight capacity of 630 lb. per dolly - Each dolly weighs 18.5 lb.