Features: This product is made of copper-zinc alloy, steel and acrylic, good texture with fine workmanship, solid, firm and durable to use, ensures a long service time. Comes with screw, springs and other mounting accessories, no extra tools needed, very easy to install and operate. This is a fantastic tremolo for manually creating a true vibrato. This is highly controllable within its range of motion and requires little force to operate. Great guitar accessory part, quite suitable for ST guitar. Specifications: Condition: 100% Brand New Material: Copper-zinc Alloy+Steel+Acrylic Weight: Approx. 230g / oz Bridge Size: Approx. 8.4 * 4.9 * 4cm / 3.3 * 1.9 * 1.6in(Total), 10.5mm / 0.4in(String Spacing / Spring Installation Hole Spacing) Backboard Thickness: Approx. 2mm / 0.1in Saddle Thickness: Approx. 5mm / 0.2in Bridge Mounting Screw Size: Approx. 2.7cm / 1.1in Package list: 1 * Bridge 6 * Bridge Mounting Screw 1 * Tremolo Bar 1 * Claw 2 * Claw Mounting Screw 3 * Spring 1 * Allen Wrench Note: The color of spring fixed claw is shipped randomly, and make sure you will not mind before ordering. .