This metal control knob and wrench set is designed for precise manual adjustment of various functions. Ideal for use with synthesizers, electric guitars, and other electronic instruments. Suitable for guitar and bass players. Features: - Color: As shown - Material: Metal - Size: Approximately 1.90 x 1.90 x 1.90 cm (0.75 x 0.75 x 0.75 inches) - Practical guitar knobs and wrench included; makes a great gift for musicians in need of replacement or upgraded electric guitar knobs - Meets standard installation requirements; simple and easy to use - Easy to install; resistant to aging, made from solid, durable, and corrosion-resistant material - High-quality construction at an affordable price; professional-grade musical instrument accessory