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Specification: Material: HHS high-speed steel Shank size: 1/4" Size: 5/64 Inch, 7/64 Inch, 9/64 Inch, 11/64 Inch, 13/64 Inch, 5mm, 1/4 Inch Total Weight: 213g Applications: 5/64": Hole cutting diameter is about 2mm, for 2.2 - 2.8mm tapping screw. 7/64": Hole cutting diameter is about 2.8mm, for 3.0 - 3.5mm tapping screw. 9/64": Hole cutting diameter is about 3.5mm, for 4.0 - 4.5mm tapping screw. 11/64": Hole cutting diameter is about 4.5mm, for 5.0 - 5.5mm tapping screw. 5MM: Hole cutting diameter is about 5mm, for 5.5 - 6.0mm tapping screw. 13/64": Hole cutting diameter is about 5.1mm, for 5.6 - 6.1mm tapping screw. 1/4": Hole cutting diameter is about 6.3mm, for 6.8 - 7.3mm tapping screw. Package includes: 1 x 7 pieces NUZAMAS Self-Centering Hinge Drill Bits