Specifications ◆ Model Name: GE101T ◆ Finish (Color): GG / Gold ◆ Type: Tremolo Unit ◆ String Pitch: 11.3mm ◆ Contents: Tremolo body, arm, mounting screws x6, springs x5, spring holder, holder set screws x2, wrench, instruction manual This is the GOTOH GE101T, a 6-point support type synchronized tremolo unit. It's a reliable item, also used in high-end brand guitars. Made in Japan, it's a high-quality, premium part from GOTOH, a company renowned for its quality! There's no other company in Japan that can produce products of this quality. The screw spacing for mounting is 11.2mm, a common metric standard. Many models can be swapped out directly. GOTOH's official website has a dimensional chart, which is the most reliable way to confirm compatibility. The nut and bridge (tremolo unit) are where the vibrations of the strings are first transmitted. If you cut corners here, even a body and neck made of good wood won't matter. Please refer to the GOTOH official website for the diameters, sizes, and other specifications.