Here are two antique cast iron and porcelain caster wheels. I don't know what their original purpose was but they have double wheels and swivel. They measure 1 1/2" across x 2" wide and the wheels are 1 1/8" wide. The mounting bracket measures 1 5/8" across and the three holes are 3/4" on center. There are no cracks in the porcelain and they have not been cleaned, all patina is original.