Specifications ◆ Model Name: GE1966T ◆ Finish (Color): B / Black ◆ Type: Tremolo Unit ◆ String Pitch: 10.8mm ◆ Sustain Block: 36mm ◆ Contents: Tremolo unit body, all accessories (arm, lift-up bolt, springs x4, spring holder, holder set screws x2, screws, wrenches x3 types), instruction manual This is the GOTOH Floyd Rose-type tremolo unit, the "GE1996T". Made in Japan, this high-quality, premium part is from GOTOH, a company renowned for its excellence! It features GOTOH's unique arm with adjustable torque, stud lock function, and, above all, unparalleled precision. ★ The sustain block is 36mm. (The photo shows a 40mm block, but the product for sale is 36mm.) For other details, please refer to the GOTOH official website for a dimensional chart. It's the most reliable source. We also have locking nuts that can be used with this unit, so please consider purchasing them together. The nut and bridge (tremolo unit) are the first points where the vibrating strings transmit their energy. If you cut corners here, even a body and neck made of good wood won't matter. Accessories/Parts...Bridge