Handmade jack clamp for musical instruments. This is a jack clamp used to mount output jacks, such as those for bridges or contact pickups, on instruments like mandolins and violins. It secures the jack to the body/bottom using a metal clamp. * Body/Jack mounting hole diameter: 13mm The standard output jack of Fishman, LR Baggs, etc. (outer diameter 12.2mm) is fixed to the body with double-sided tape and inserted. The length and angle of the clamp and body parts can be adjusted. (The parts of the body and clamp that contact the instrument are covered with cork to prevent scratches.) Spec ・Clamp part/Length adjustable turnbuckle type (gold/made in Germany) ・Exterior: Natural cork ・Output jack holder part/Ebony (blackwood) mounting hole diameter 12.2mm ・Application: Universal * If purchased simultaneously with the Fishman M-100 mandolin pickup also listed, this item will be discounted by 10%. Also, please note that this is a handcrafted product, so price reductions are not possible. Please contact us via the comment section beforehand.