Thank you for viewing. This is a tremolo unit removed from a Fender Japan ST-314-55. String spacing: 10.5mm, brass block type saddles 6-point support Block height: 39mm The ENDROX mechanism passes the strings from the headstock side, pulls them until the ball end hits the peg post, and then tightens them with the locking screws on the bottom of the block, suppressing tuning instability during arming, similar to locking tuners. Although it wasn't originally present, I've added washers as a self-improvement. The original tremolo arm was M5, but it broke, so it has been widened to M6. All three included arms have M6 threads. Also included are anchor screws, a hanger, and three springs. Please note that it has been used for nearly 40 years and has a corresponding level of wear and tear.