Vacuum Brazed Technology Multi-purpose for grinding inner edge Enlarge holes after drilling work
| Dia | Workable/Total Length | Thread |
| 2-35mm | 35/47mm | M14or5/8-11Thread |
| 2-38mm | 36/48mm | M14or5/8-11Thread |
| 20-48mm | 36/48mm | M14or5/8-11Thread |
| 0-50mm | 44/56mm | M14or5/8-11Thread |
| 35-75mm | 54/66mm | M14or5/8-11Thread |
| 3-75mm | 73/85mm | M14or5/8-11Thread |



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