Specifications ◆ Model Name: GE1966T ◆ Finish (Color): B / Black ◆ Type: Tremolo Unit ◆ String Pitch: 10.8mm ◆ Sustain Block: 33mm ◆ Contents: Tremolo unit body, complete 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 company renowned for its excellence! GOTOH's unique arm with adjustable torque, stud lock function, and above all, its high precision is unmatched. ★ The sustain block is 33mm. GOTOH's standard specification is a 40mm block. There are no other differences. We also have locking nuts that can be combined with this unit, so 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.