This set of casters already have the leg sockets. They are ready to install. The wood wheels are in good shape, with no cracks or flat sides. The sockets can be popped off and hammered into the wooden leg. The caster is then snapped into the leg socket.
The stem of each socket is 1 1/2 inches long and 1/4 inch thick. The socket is 3/8 inch wide at the base. The height of the caster from the base of the stem to the floor is 1 3/8 inches. The wheels are 1 1/8 inches in diameter.