Bore small, clean holes at any angle in a variety of materials with the Milwaukee 6-Piece 6inch Universal Flat Boring Bit Set. These premium quality Flat Boring Bits are made of heat-treated high carbon steel, so the drill points and cutting edges can be re-sharpened for cost savings and long life. Bore clean, fast holes at any angle in wood, plastic, plywood and Formica. These bits offer a 6inch drilling depth but can be used with a 12inch extension (48-28-3350) for extended deep-hole drilling. 3/16inch shank diameter. The set consists of six of the most popular size bits (3/8inch, 1/2inch, 5/8inch, 3/4inch, 7/8inch and 1inch) in a carrying case.