This set of 4 casters is heavy brass, but have a dark patina. The leg caps measure ID 15/16 inch square and one inch deep. There are two holes in each leg cap for the use of screws or tacks to secure the caster to the leg. The wheel saddles swivel a 180 degrees. The wheels themselves are 7/8 inch in diameter. The distance between the base of the cap and the floor is 1 1/2 inches.
Even though these wheels are small, the whole unit is stout and strong.