The Merritt Sentry Universal Rear Hub Guard is designed to be ran on the outside of the frame making it even more universal in the fact that it can be used on the driveside or non-driveside. Designed to work with pretty much every frame out there as there is no need to stretch the frame to get the guard to work. Made from a strong nylon material paired with a steel insert for added durability. Merritt provides an axle adapter to work with either 14mm or 3/8" applications.