bridge for e-guitar, tune-o-matic, stud spacing 73,5mm, stud diam 6,0mm, nickel Boston Musical Products is also known for its wide range of guitar parts for both electric and acoustic guitars, but also bass and other string instruments. With over 3,000 guitar parts, Boston is ideal to upgrade or repair your instrument, but also building your own instrument is a possibility. specifications anchor diameter: 12 mm anchor length: 20 mm thread studs: m8 spacing studs: 74 mm string spacing: 52 mm stud top diameter: 6 mm radius: 16; wire retainer: yes notched saddles: yes finish: nickel