Manufacturer Part Number: 557u 4|Taper Pin Size|#4Small End Diameter (Decimal Inch)|0.2071Flute Type|SpiralShank Type|SquareOverall Length (mm)|Overall Length (Decimal Inch)|4.0625Overall Length (Inch)|4-1/16Coating/Finish|Bright/UncoatedFlute Length (mm)|Flute Length (Inch)|2-9/16Flute Length (Decimal Inch)|2.5625Large End Diameter (Decimal Inch)|0.2604Shank Diameter (Decimal Inch)|0.2656Shank Diameter (mm)|Shank Diameter (Inch)|17/64Shank Diameter|17/64Spiral Direction|Left HandTool Material|High Speed SteelSeries|557UTool Application|Hole Enlarging; Hole Finishing; Hole ShapingTool Performance|General PurposeCutting Direction|Right HandPrimary Workpiece Material|Primary Workpiece Material Code|Secondary Workpiece Material|Secondary Workpiece Material Code|Taper Rate|1:48Number Of Flutes|Product Service Code|UNSPSC Code|