This is a Mustang-type adjustable saddle bridge set that can be used for Jazzmaster, Jaguar, and Mustang guitars. Removed from a FENDER MADE IN JAPAN HYBRID JAGUAR. I believe it is compatible with Japanese specifications. There is some clouding on the metal, but there are no particular problems with rust or use. The short octave screw on the 6th string side is the original specification. Loctite has been applied to the set screws, so they won't turn on their own. The embedded bushings for the guitar body are new. Saddle size: 11mm E to E: 55mm