This official Fender Jaguar/Jazzmaster Tremolo is used on their Japanese made guitars from 1986-1999 and features the 'Fender' and 'Pat # 2972923' stamp on the base plate. The spring tension of the tremolo is easily adjustable from the top of the guitar using the centre front screw and it also features the tremolo locking mechanism where sliding the lock button back holds the tremolo in to a dive only mode (and stops your guitar going out of tune if a string breaks). Mounting screws are NOT included.