Solid carbide twist drills within chilled 3 × D
Advantage: suitable for gray cast iron, spherulitic cast iron, cast aluminum and other materials processing centering ability, have a stable cutting edge shape can be obtained stable dimensional accuracy and good surface quality for high-speed high-feed cutting.
| Specifications (inner cooling) | Blade length | Shank Diameter | Handle length | Overall Length |
| Φ3.3-Φ3.7 | 20 | 4 | 28 | 54 |
| Φ3.8-Φ4.0 | 24 | 4 | 28 | 58 |
| Φ4,1-Φ4.7 | 24 | 6 | 36 | 66 |
| Φ4,8-Φ6.0 | 28 | 6 | 36 | 66 |
| Φ6.1-Φ7.0 | 34 | 8 | 36 | 79 |
| Φ7.1-Φ8.0 | 41 | 8 | 36 | 79 |
| Φ8.1-Φ10.0 | 47 | 10 | 40 | 89 |
| Φ10.1-Φ12 | 55 | 12 | 45 | 102 |
| Φ12.1-Φ14 | 60 | 14 | 45 | 107 |
| Φ14.1-Φ16 | 65 | 16 | 48 | 115 |
