KYOCERA OTM86017 SHCS-CB Interchangeable Pilot Weldon Flat Shank Indexable Counterbore, 0.422 in Dia Bore, 1/4 in Socket Head Cap Screw, 3/4 in Dia Shank, 0.422 in Dia Min Cutting, 0.54 in Max Counterbore Depth, TCMT 18151 Insert, 1 Inserts