Wilkinson by Gotoh gold finish combination wrap tailpiece and bridge assembly. Intonation is adjustable on the B/G and D/A string pairs. 3-1/4"(83mm) stud spacing. Studs are M8 thread. Stud insert diameter is 7/16"(11mm). This bridge will retrofit most USA Gibson® models if you re-use the Gibson® factory studs to mount it.