VEGA Double Square #2 Bits. Professional Grade 1/4" Hex Shank #2 Double Square 2. Professional Grade 1/4" Hex Shank #2 Double Square 2" Power Bits. VEGA Professional Grade Double Square #2 Bits. All Vega bits are made from shock resistant S2 modified steel and have a Rockwell hardness of between 58-62 HRC.