The Tremolo Arm Tip is the materiel Fender used right after the bakelite 1954 Threw sometime in 1956 , and before Fender went ABS plastic in 1957 and still use up to even today...
The threads are good for the Trem Arm, and the owner had the arm professionally had a short amount of the threads cut off to lower the the reach for using the Tremolo.. As David Gilmour. Jeff Beck always did.