Description:This portable wench can tighten or loosen most thumb nuts or thumbwheels found on guitars, such as output, controllable potentiometer, pickup switch, tuning machine, and bridge thumbwheels. All edges and surfaces have been chamfered and polished to avoid damage to the body and surrounding areas. A good multi-tool for repairing an electric bass guitar, the end of the multi spanner is designed to be loosened; The other is designed for tightening luthiers portable wrench tool, store it in the guitar bagSpecifications:Material: Metal Weight: 1.1oz/30gD x W: 95x28mm/3.7x1.1 inchPackage Included:1 x Guitar KeyNote:1. Please allow 1mm error due to manual measurement. Make sure you don't mind before bidding.2. Due to the different light, angle and display taken by the camera, the picture may not reflect the actual color of the subject.3. Thank you for your understanding.