tremolo Wilkinson type, pitch 10,8 mm, 2 pivot points, gold A unique, high quality tremolo with saddles that lock to a hardened steel baseplate for better tuning stability, string energy transfer and sustain. Each saddle is height-adjustable. Threaded studs and bushings, springs, spring claw, allen wrenches and adjustable-tension arm are included. &;lt;br&;gt;&;lt;br&;gt;This tremolo fits American Std ST and ST+ guitars without modifications. 2-1/8&;quot; (53.97mm) string spread, 2-3/16&;quot; (55.56mm) center-to-center stud spacing. Use a 3/8&;quot; (10mm) drill bit to install the bushings. &;lt;br&;gt;&;lt;br&;gt;