Big Rock Allparts Bullet Guitar Jack Tightener
Allparts Bullet Guitar Jack Tightener, Special Tool, Tighten the jacks on guitars or amplifiers from the outside, Without twisting or shorting the wires, Compact size, Made of smooth moulded plastic to prevent scratching, Fits US size 12.7 mm (1/2"") nuts and 1/4"" (6.3 mm) sockets