ITEM NAME:42.5mm Zinc Alloy Electric Guitar Locking Nut String Lock w/ Wrench(Black) A#S Product Description Description: Specifications: Product material: zinc alloy Product color: black Product size: 42.5 x 13 x 11.5mm/1.67 x 0.51 x 0.45" Product weight: 38g Scope of application: for electric guitars Included: 1 x Guitar Locking Nut String Nut 1 x Gasket 2 x Screws 2 x Allen Wrenches.Included: 1 x Guitar Locking Nut String Nut. Product material: zinc alloy. Scope of application: for electric guitars. Product color: black. If item is defective after 3 months, you can still send it back to us.