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. specificationsbushing diameter: 12mmbushing length: 19,5mmthread studs: M8spacing studs: 74,0mmstring spacing E-e: 52mmdiameter studhole: 6mmradius: 12"wire retainer: nosaddles notched: yesfinish: gold