Universal base for Tunamatic bridge installation on jazz guitars. Suitable for 73.5 and 89.5 mm stud spacing. Two rosewood base pieces are connected by a flexible pertinax strip, so they adjust perfectly to the curve of an arched guitar top. The bridge is mounted on two threaded studs, like on a classic jazz guitar bridge. Enclosed are: 2 different pertinax strips to match the two stud spacings, 2 pairs of M4 studs (20 and 25 mm), and 2 thumbwheels for height adjustment. Tunamatic bridge not included!