VERSATILE FOUR PLACE TURRET PART NUMBER FPT-150, USED FOR MOUNTING ADJUSTABLE BALL BAR ENDS. THIS TURRET HAS FOUR, FIVE SIXTEENTHS INCH ( 5/16”, 0.3125”) [7.9375MM] DIAMETER NATIONAL COARSE FEMALE THREADS THAT MATCH THE INTERNAL THREADS IN THE ADJUSTABLE BALL BAR ENDS. THIS TURRET WILL HOLD A VARIETY OF FOUR ADJUSTABLE BALL BAR ENDS SIMULTANEOUSLY.