This Avantco 178A4PCKIT8 4" plate caster set can be used to replace a set of damaged casters, or you can use it to make stationary equipment mobile for easier cleaning and maintenance! This set contains 4 casters with brakes and 4 without brakes, and it is designed for use on select Avantco equipment. Each caster has a 4" diameter and raises the unit 5" off of the ground. The mounting bolts are included.