String Spacing 53.5mm/2.11 inch ;Post Spacing 74mm/2.91 inch ;Nut width 42mm/1.65 inch ; Mounting Screws Spacing 52.5mm/2.1 inch .  Double vibrato system usually has two parts,neck lock and bridge vibrato system.  In addition to pressing down the handle, the double shake can also lift the handle up to make the string sound increase or decrease semitone, full tone or two or three full tone.  This tremolo bridge is made of metal, good texture with fine workmanship,firm and durable to use.  The tremolo bridge comes with screws and wrench, it is easier for you to assemble.  Fits for electric guitar,locking tremolo, with Locking nut.  Made of qualified zinc alloy, the tremolo bridge with fine workmanship is durable and sturdy.  The lightweight and portable size makes it convenient for you to carry out, and you can play your guitar with them for better permance anywhere.  It helps you manually creat the true vibrato by changing the intonation and height level.  All the mounting accessaries are also included in the package, making it easy to install without other tools required.  Colour:Silver+black  Material:A-Zinc alloy/B-Zinc alloy + plastic    Package Contents:  1 x main body  1 x rocker  3 x tension springs  1 x upper pillow  2 x upper pillow screws  1 x hook  2 x hook screws  2 x positioning posts  2 x hex wrenches    Only the above package content, other products are not included.  Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.