Keo , #6 x 6" hss aircraft counterbore drill bit

What is for sale: Keo , #6 x 6" hss aircraft counterbore drill bit

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THE DRILL BIT IS SHINNIER AND CLEANER, NEWER LOOKING THEN THE PICTURE SHOWS
STAMPED ON TO THE BIT.......KEO #6 X 6" HSS
LOOKS TO ME TO BE A 1/2" DIA. SHK. BY 3/16" PILOT HOLE. OR JUST OVER OR JUST UNDER. THATS ME USEING MY OLD EYE'S AND A TAPE MEASURER