Evolution casters are the industry’s toughest maintenance-free caster for harsh towing applications. The large, precision radial bearing (3-1/2 diameter) is sealed on both sides for an exceptionally smooth swivel. The fork makes up part of an ergonomically-friendly caster that confidently handles shock loads, easily starts and stops, effortlessly moves over thresholds, and reliably negotiates uneven surfaces. Anyone who needs a caster that can hold up in dynamic towing applications will find a reliable solution with the Colson Evolution.