Threaded bushings suitable for many asian Jazzmaster®/Jaguar® style guitars that have Tunomatic or other bridges mounted on M4 threaded studs. 9mm. For USA made guitars.
The rear edge has six notches through which the strings run from the tremolo system. This is the only way to combine a typical T-style bridge - still the crucial factor for an official twang sound - with a top-mount tremolo system.