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, "GE1996T". Made in Japan, this high-quality, premium part is from GOTOH, a renowned brand! GOTOH's unique torque-adjustable arm, stud lock function, and above all, its high precision are unmatched. ★ The sustain block is 36mm. (The photo shows a 40mm one, but the product for sale is 36mm.) For other details, please refer to the GOTOH official website for the dimensional chart. We also have locking nuts that can be combined with this unit for sale. Please consider purchasing them together. The nut and bridge (tremolo unit) are where the vibrating strings first transmit their vibrations. If you cut corners here, even a body and neck made of good wood won't matter. Accessories/Parts...Bridge