- All edges and surfaces are beveled and polished to prevent damage to your instrument and surroundings, ensuring safety during use. - This portable wrench is designed specifically for guitar builders, making it a practical addition to your guitar case for on-the-go repairs. - The compact toolkit can effectively tighten or loosen most nuts or thumbwheels on guitars, such as output jacks, control pots, pickups, tuning machines, and bridge knurled wheels. - It's an essential multitool for electric guitar and bass maintenance; one end of the wrench is engineered for loosening, while the other is for tightening, providing versatility for various applications. Use scenarios: 1. Quickly adjust your guitar's output jack during a gig to ensure optimal sound performance. 2. Easily fine-tune your tuning machines at home or during rehearsals with this must-have tool. 3. Maintain your bass by securely tightening the control pot before a performance to avoid any mishaps. This product combines functionality, compatibility, and ease of use, making it an indispensable tool for both amateur and professional musicians.