Fender USA Genuine Tremolo Unit and Callaham Block (MADE IN USA) Assembled Set Features: A tremolo assembly for modern-style Stratocasters with 2-point support, compatible with American series Stratocasters manufactured after 2008. Specifications: ■ Tremolo unit for American Strat (compatible with 2008-current models) ■ Chrome ■ 42mm block ■ String spacing: Approximately 53mm ■ Arm mounting: #10-32 thread Tremolo Block ■ For American Standard style ■ Features ・ Uses cold-rolled, lead-free U.S.A. steel ・ Clear tone and rich sustain ・ Equipped with a Delrin arm support bushing to reduce arm wobble ・ Direct arm action and reduced damage to the arm ■ Specifications ・ String spacing (E to E): 2 1/16" (approx. 56.39mm / 5 = approx. 10.5mm pitch) ・ Arm thread: Inch standard #10-32 (Effective arm diameter in mm: approx. 4.8mm) ・ Mounting screw hole center-to-center pitch: Approximately 21mm (※) ・ External dimensions: Approximately W76.5 x H41.6 x D12.9mm (※) ■ Inch standard