The string locking nut is for 6-string electric headless guitar, you can observe the detailed size in the picture, zinc alloy material offers it well durability, it helps to tightly lock the string.Specifications: Material: Zinc Alloy Suitable for: 6-string Electric Headless Guitar Color: Black Item Size: 4.25 x 2.62cm / 1.7 x 1.0in Item Weight: 65g / 2.3oz Package Size: 4.5 x 3 x 3cm / 1.8 x 1.2 x 1.2in Package Weight: 66g / 2.4ozPackage List: 1 x String Locking Nut 2 x Wrench 2 x Screw