16 Piece Forstner Drill Bit Set. Professional grade and Precision machine grounded. Cuts accurate angles with smooth surfaces and drills flat bottom holes and cuts through any type of grain including knots. All bits have a 3-1/2" overall length and a 3/8" shank. 16 Piece Forstner Drill Bit Set and Sizes include 1/4", 3/8", 1/2", 5/8", 3/4", 7/8", 1", 1-1/8", 1-1/4", 1-3/8", 1-1/2", 1-5/8", 1-3/4", 1-7/8", 2" and 2-1/8" in a wood case.