For sale is a set of (4) Heavy Duty Industrial Castors. 4" Diameter X 2" Wide Wheels. Approx. 4-1/2" X 3-7/8" Attachment plate on each castor. Sets consists of (2) swivel-type wheels and (2) non-swivel wheels. Several sets currently available. All appear to have been manufactured by Fairbanks or Faultless, and are marked "Made in USA."