3 Flats Drill Bits 29/32" are reduced shank drill bits made of High Speed Steel. Bisco Tool Supply sells Reduced Shank Drill Bits with a 1/2" shank, 6" OAL and 3" of Flute Length. 3 Flatted or 3 Flats Drill Bits have surface treated flutes with a reduced flatted shank. USA Made 3 Flats drill bits expand the size range capacity of a portable drill chuck. Common Flute and overall length for minimal adjustment during tool changes. Precision ground for high degree of concentricity between shank and body diameter. 3 Flats Drill Bits are ideal for drilling in low and medium tensile strengh materials. Call Bisco Tool Supply Toll Free 1-866-247-2635 for drill bit questions.