Model Number: WD-007 Key Specifications/Special Features: Handle auger bits1) Special shank design, good for using by hand.2) Solid center flute provide added rigidity.3) Self feeding screw pulls bit into wood for precise and easy drilling.4) Full length heat treatment guards against bending bit in heavy-duty applications.6) For precise drilling in general hard and soft wood.Metric sizes (mm):Diameter: 6, 8, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 28, 30mmOverall Length: 400mm, 460mm, 500mm, 600mm, 650mmFractional sizes (Inch):Diameter: 1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4", 13/16", 7/8", 15/16", 1", 1-1/8", 1-1/4",Overall length: 16", 18", 20", 24", 26"