Manufacturer Part Number: C13143|Drill Bit Size (Inch)|Drill Bit Size (Wire)|#21Drill Bit Size (Letter)|Overall Length (Inch)|6Tool Material|High-Speed SteelCoating/Finish|Bright/UncoatedSeries|3957-6Drill Point Angle (Degrees)|135Drill Bit Size (Decimal Inch)|0.1590Shank Type|Straight-CylindricalFlute Type|SpiralFlute Length (Inch)|2-1/8Flute Length (Inch)|Flute Length (Decimal Inch)|2.1250Cutting Direction|Right HandMaximum Drilling Depth (Decimal Inch)|Maximum Drilling Depth (mm)|Flute Length X Diameter Ratio|Self-Centering|YesPoint Type|SplitDrill Bit Diameter Tolerance|+0.0000 to -0.0007 inShank Diameter (Inch)|Shank Diameter (Decimal Inch)|0.1590Number of Flutes|2Web Thinning|Web-ThinnedWeb Configuration|TaperedTool Performance|General PurposeStandards|NAS 907 Type BProduct Service Code|UNSPSC Code|