Commonly Used On Solid Body Guitars. It Is Manufactured Of Diecast Aluminum. Most Of The Virtues Of Bigsby®'s U.S. Sand Cast Tremolo At A Lower Price. Does Not Include Bridge. Overall Length: 4 5/16”/ 109.5 mm Overall Width: 3 13/16”/96.8 mm Arm adjusts with 1/8” Allen wrench and 5/16” socket wrench.