This old set of steel casters are sturdy and were meant to hold a substantial amount of weight. The wheels are stamped steel and the four matching casters come with their original sockets.
Each wheel measures 1 3/4 inches in diameter. The wheels are stamped, not solid. The yoke is made of heavy steel. From the top of the yoke to the floor is 2 1/4 inches.
The stems are 2 1/4 inches long, but from the base of the socket to the tip is 1 5/8 inches. After inserting the socket into each leg, the base of the stem will be exposed (see photo), adding another 1/2 inch to the height of the caster.
The sockets can be removed if so desired.