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Specification of hollow drill tool and twist drill bit
| Diamond coated hollow drill tool | Twist drill bit | ||
|---|---|---|---|
| Outer diameter | 4.5 | Number of cutting lips | 2 |
| Inner diameter | 2.9 | Helix angle: | 8.4° |
| Mesh size | 80–100 | Point angle | 120° |
| Areal average abrasive/grain density | 15 abrasive/mm2 | Tool base material: | Stainless steel |
| Abrasive/grain type | Diamond | ||
| Tool shank material | EN-31 | ||
| Abrasive/grain coated method | Electroplating | ||
