This tremolo arm is made of hard metal with plating for strong durability. It features 5.0 mm arm diameter, and is designed for electric guitar single tremolo bridge system. With this arm, you can easily adjust the string tension and change the tone to get better tremolo effects. instrument guitar parts replacement for guitar lovers and players. Features - Item: Single Tremolo System Bridge Arm - Material: Metal, Plastic - Color: Silver - Arm length: Approx. 165 mm - Arm thread diameter: 4.8-5.0 mm - Thread spacing: 1mm - Made of iron with plating, high glossiness and strong durability. - Single arm tremolo whammy . 4.8-5.0 mm arm thread diameter, easy to use. - Fits for electric guitar single tremolo bridge system with M5 bolt. - Helps you to easily adjust the tension of string and change the tone to get better tremolo effects. - instrument guitar parts replacement for guitar lovers and players. Package list: 1 x Whammy