Evolution casters from Colson are the industry’s toughest maintenance-free caster for harsh towing applications. Automotive, tire manufacturers, and anyone who needs a caster that can hold up in dynamic towing applications will be especially interested in this product. The precision radial bearing is large at 3-1/2? in diameter and is sealed on both sides for an exceptionally smooth swivel. This 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.