■ Set of 4 screw-type casters, approximately 100mm in diameter. The wheel width is approximately 25mm. They are made of plastic. The screws are metal. The items you will receive are the 4 in the first photo. The others are photos taken from different angles. (The diameter of the wheels may appear slightly different in the first photo, but they are all the same diameter, approximately 100mm.) I am an amateur, so these are approximate measurements: The screw length is approximately 25mm, and the screw diameter is approximately 16mm. Please forgive any inaccuracies. Nuts are not included. They are new, but there is no box or instruction manual. Only one (in the 3rd and 4th photos) has a lever that can be used to stop the wheel from turning. Instant purchase is welcome. Please refrain from price negotiations. Free shipping throughout Japan (shipping included). Thank you.