This is an original cast steel wheel from a Singer treadle sewing machine cast iron base. These same wheels were used on cast iron bases forever. I guess they got it right in the beginning and never had to change them. Includes the axle pin or rivet. This is a nice old wheel in great clean condition. Very easy to change over and will fit any Singer treadle base ever made. Diameter is 1 1/4" and the width at the OD is 3/8". The early wheels were a bit wider at 1/2".
If you are fixing up Grandma's old machine and you want an original clean vintage wheel, this is it. This wheel is in very nice shape and will look and work great on your machine.