EZ4 & EZ5 brackets have a clean, uncluttered look. A spring loaded locking device allows the brackets to be recessed even farther than earlier models. The lock 'Click' as each of the front arms are rotated into position; pull a ring and twist the front arms 9o degrees to remove them.
MS Series mounting brackets are for motor home mounted tow bars. They are the same as the MX series brackets except the front arms are not removable.