Walthers Proto MAX(TM) couplers are an easy upgrade for old or new equipment and provide magnetic uncoupling action. Fully assembled, they fit most HO equipment, and each realistic coupler features a tough die cast metal head and shank, factory-installed metal knuckle spring, and a separate metal centering spring. Plastic draft gear boxes are also included.
 
This coupler set shortens the distance between locomotives, such as F units, to provide close-coupling for more realistic appearance.