This style of metal casters is less common. They have the tension socket fitted to the stem. These wheels also swivel in addition to moving forward and backwards. All four wheels are in good working condition. There is some surface rust which can be removed with an oiled rag.
Each steel wheel measures 1 1/4 inches in diameter. The height of the wheel and its bracket to the bottom of the stem is 2 inches. The width of the stem socket is 3/4 inch. The stem itself is 1 3/4 inches long.