Abstract: A drop tuner of the present invention has: a lock screw projected from a main saddle which is rotatably supported by the drop tuner; and a base body supported by the lock screw so as to be capable of being inserted between the lock screw and a fine tuning screw and separated from the fine tuning screw, wherein a rotation angle of the main saddle varies when the base body is switched between an inserted state and a separated state, and a fin member projected toward a radial direction of the lock screw is provided on the base body near an end portion farther from the main saddle.

Abstract: The angle adjustment structure of intonation tools for guitar bridges which have fine tuners. There are intonation tools for guitar bridges which have fine tuners like U.S. Pat. No. 4,497,236, but these bridges have some patterns of baseplate portion, so it is difficult to match to some patterns of baseplate portion by one intonation tool. This invention makes the intonation tool capable of matching to some patterns of baseplate portion by giving angle adjustment structure.