Review on 4-Pack 1.5 Inch Swivel Stem Casters - 330 Lbs Capacity, Non-Marking Polyurethane Wheels & 3/8"- 16 X 1" Threaded Stems With Nuts For Furniture Carts Trolleys. by Anthony Arcos

Got these to turn an older front loader washing machine base into mobile platform. Though not pictured, they include a low profile wrench which helps. Some have commented that the "jam" nut is too large and not usable. IMO the nut is for installation through a non-tapped hole such as on a metal plate. All in all a great value for the money and exactly what I needed.