Wilkinson Strat Synchronized Tremolo Unit 2-point support Material: Aluminum alloy saddles, steel saddles, steel arm, zinc alloy base Package: 1 set tremolo bridge kit (including bridge arm, mounting screws, wrenches, springs, anchor pins, and pin posts) Data: 6 saddles, each 10.8mm wide, total string spacing: 54mm Spacing between 2 pin posts: 56mm, flat base 13*36mm