1.Equipped with extra-wide VA flute that massively smoothens the discharging process and optimizes the cooling effect;
2.Highly productive thanks to the large- and small- helix-angles on the front and rearends, which respectively features sharp cutting edges and a design that facilitates iron scrap discharging;
| HSS straight shank twist drill bits | |||
| Diameter(D) | Inch | Flute Length(F) | Overall Length(L) |
| 0.20 | .0079 | 2.5 | 19 |
| 0.21 | .0083 | 2.5 | 19 |
| 0.22 | .0087 | 2.5 | 19 |
| 0.23 | .0091 | 2.5 | 19 |
| 0.24 | .0094 | 2.5 | 19 |
| 0.25 | .0098 | 3 | 19 |
| 0.26 | .0102 | 3 | 19 |
| 0.27 | .0106 | 3 | 19 |
| 0.28 | .0110 | 3 | 19 |
| 0.29 | .0114 | 3 | 19 |
| 0.30 | .0118 | 3 | 19 |
| 0.32 | .0126 | 4 | 19 |
| 0.34 | .0134 | 4 | 19 |
| 0.35 | .0138 | 4 | 19 |
| 0.36 | .0142 | 4 | 19 |
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