Milwaukee Tool 48-20-9111 Rotary Drill/Hammer Drill Bits; Drill Bit Size (Inch): 1/4 ; Shank Type: 3-Flat ; Drill Bit Material: Carbide Tipped; High Speed Steel ; Shank Diameter (Inch): 1/4 ; Flute Length (Inch): 4 ; Flute Length (Decimal Inch): 4.00