Milwaukee Tool 48-20-9032 Rotary Drill/Hammer Drill Bits; Drill Bit Size (Inch): 1/2 ; Shank Type: 3-Flat ; Drill Bit Material: Carbide Tipped; High Speed Steel ; Shank Diameter (Inch): 3/8 ; Flute Length (Inch): 16 ; Flute Length (Decimal Inch): 16.