TREMOLO SYSTEM: In addition to pressing down the handle, the double locking tremolo can also lift the handle up to make the string sound increase or decrease semitone, full tone or two or three full tone. EASY TO INSTALL: Guitar bridge tremolo system is equipped with screws, springs and other mounting accessories, no additional tools, very easy to install and operate. HIGH QUALITY: Electric Guitar Bridge Tremolo System is made of high-quality metal, sturdy and durable, smooth surface coating, with high‑quality springs and cranks can play wonderful vibrato. DOUBLE LOCKING TREMOLO: Double vibrato system usually has two parts: neck lock and bridge vibrato system. Suitable for 6 string electric guitar. WHAT YOU WILL GET: 1 x Guitar Nut; 2 x Nut Screw; 3 x Spring; 1 x Spring Snap; 2 x Pull Spring Screw; 2 x Positioning Column; 1 x Joystick; 1 x Vibrato Claw; 2 x Hex Wrench.