This is the tremolo bridge that came with an Ibanez GIO. The arm was missing, so I used one that fit. The FAT-6 is a Fender-style synchronized tremolo. Instead of the knife-edge system used in many other floating tremolos, it's secured to the body with six screws along the front edge of the tremolo. The six saddles are independent, and you can adjust them back and forth by turning the screws from the back of the tremolo plate to set the correct intonation. Furthermore, each saddle has two small hex screws at the front, allowing you to individually adjust the height of each string.