IMPRESA [2 Pack] Guitar Floating Tremolo Bridge Shim - for Easy Adjustment and Tuning - Durable Plastic Trem Wedge - Electric Guitar Bridge Replacement Tool for Faster String ReplacementSave Time Repairing Get back to strumming in no time. Replacing broken strings on a floating guitar bridge tremolo doesn't need to be meticulous. Use this innovative electric guitar parts shim to greatly reduce your string adjusting time Alignment Made Easy No need to continuously hold the whammy bar for electric guitar down when adjusting or removing strings. Simply push the bar down once and slide the string changer guitar shim under the bridge.