There are 26 identical casters with 2 inch hard rubber wheels. Some of the wheels say "BASSICK" on the side. Each caster has a metal yolk with a 2.5 inch stud. Each stud is threaded and has 2 flats on opposite sides. There are 2 nuts on each stud. A "B" with a circle around it is stamped on the side of each yolk.The studs on 6 casters have been sawed off to 1.75 inches.