Features: This portable wench could tighten or loosen most nuts or thumb wheels found on guitars such as output jack, control pot, pickup switch, tuning-machine and bridge thumbwheels. All edges and surfaces have been chamfered and polished to avoid damage to body and surrounding areas. Good multi-tool for electric guitar bass repair,one end of the multi-spanner is designed for loosening,the other is designed for tightening. High-quality, all made of high-quality metal, ensuring logevity and strength, sturdy, corrosion resistance and durable for long-time use. Small and light, easy to carry and use. you can store this little metal wrench in your guitar cases or other-places. Specifications: Material:Metal+Anti-scratch Cotton Note: Please allow 1-2cm errors due to manual measurement. Due to the differences betweeen differents monitors,the picture may not reflect the actual color of the item. Package includes: 1 Piece Guitar Spanner Wrench