Drill bit SR28
| 钎头-球型截齿 BUTTON BIT - Spherical buttons | ||||||||||||
| 直径(mm) Diameter | 37 | 38 | 41 | 43 | 45 | |||||||
| 截齿数量 No. of buttons | 7 | 7 | 7 | 7 | 9 | |||||||
| 冲水孔 Flushing hole | side | 1 | 1 | 1 | 2 | 1 | ||||||
| centre | 1 | 1 | 1 | 1 | 3 | |||||||
| 钎头-子弹型截齿 BUTTON BIT - Ballistic buttons | ||||||||||||
| 直径(mm) Diameter | 38 | 41 | ||||||||||
| 截齿数量 No. of buttons | 7 | 7 | ||||||||||
| 冲水孔 Flushing hole | side | 1 | 1 | |||||||||
| centre | 1 | 1 | ||||||||||
| 十字型钎头 Cross-type bit | ||||||||||||
| 直径(mm) Diameter | 38 | 41 | ||||||||||
| 冲水孔 Flushing hole | side | 1 | 4 | |||||||||
| centre | 1 | 1 | ||||||||||
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