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 made by GOTOH, a company renowned for its quality! GOTOH's unique arm with adjustable torque, stud lock function, and above all, its high precision is 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 table, which is more reliable. Also, we are also selling the locking nut that can be combined 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, it won't matter how good the body and neck wood are. Accessories/Parts...Bridge