FOR SALE IS THIS SERRATED CUTTER !!!!!!!!—–THREAD MILL!!!!!

NOT TOO SURE WHAT THESE ARE FOR—–MAYBE SOMEONE CAN ENLIGHTEN ME?

SD4289—-90 DEGREE SERRATIONS X 0.030″ PITCH.

6.4MM DIA TAP LIKE SHANK.

SERRATIONS DON’T LOOK LIKE THEY ARE FORMED LIKE A TAP (HELICAL)

THEREFORE THIS IS USED AS A CUTTER (NOT LIKE A TAP–SCREWED IN)

POSSIBLY FOR GENERATING FORMS?? ON A CNC MACHINE ETC.

3 FLUTED—-24MM FLUTE.

ITEM SHARP—-LOOKS UNUSED—-SEVERAL FOR SALE SO STOCK PHOTO.