• Protects guitar strings and extends their lifespan, preventing breakage. • Compatible with various electric guitars and basses. • Retainer dimensions: 10.8mm x 11mm x 12mm (Length x Width x Height). • Mounting hole diameter: 3mm. • Ball diameter: 5mm. • Rust-resistant material, durable and long-lasting. • Easy to mount and use, small and lightweight for carrying. • Placement instructions: 1. Choose the appropriate retainer size; 2. Remove the old retainer; 3. Place the new retainer on the electric guitar. • Make sure to choose the appropriate retainer size for your guitar.