1-9/16 X 1″ Depth of Cut High Speed Steel Annular Cutter ~ Production grade. ~ Pilot holes. ~ For general purpose hole making. ~ Made of high speed steel, heat treated and tempered for maximum strength. ~ Hardened and ground. ~ 3/4″ shank diameter. Production grade. Pilot holes. For general purpose hole making. Made of high speed steel, heat treated and tempered for maximum strength. Hardened and ground.