Specifications ◆ Model Name: GE1966T ◆ Finish (Color): B / Black ◆ Type: Tremolo Unit ◆ String Pitch: 10.8mm ◆ Sustain Block: 33mm ◆ Contents: Tremolo unit body, all accessories (arm, lift bolt, springs x4, spring holder, holder 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 made by GOTOH, a company renowned for its excellence! It features GOTOH's unique arm with adjustable torque, stud lock function, and above all, its precision is unmatched. ★ The sustain block is 33mm. GOTOH's standard specification is a 40mm block. There are no other differences. We are also selling the locking nut that can be used with this unit. Please consider purchasing it 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.