12" Bit Extension for Various Bits (7/16" Hex Shank) Extend your reach a full 12" when drilling with Milwaukee self feed bits, auger bits and hole saws. The quick change shank is 7/16" hex. The 7/16" hex fits both 3 jawed chucks, 1/2" drill capacity and larger, as well as 7/16" quick change chucks. Features: 12" Long 1/2" Drill Capacity 7/16" Shank Since its founding in 1924, Milwaukee has focused on a single vision: To produce the best heavy-duty electric power tools and accessories available to the professional user. Today, the Milwaukee name stands for the highest quality, durable and reliable professional tools money can buy.