4 Flutes, Single End 30 degree RH Spiral, TiAlN coated for improved performance and tool life in harder materials or high temperature applicationsPrecision ground using the highest quality grinding wheelsStraight shank design is more suitable for many electric drills and drilling machinesHigh cutting efficiency, long life,colour: SilverSize: 1/4x1/4Material: HSSlength of cut x 2-1/2inch overall lengthCutting Diameter Tolerance: +.0000/ -.0012inchShank Diameter Tolerance: +.0000/ -.0005inchPackage include: 5 x Twist Drill BitNote: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.
