Basic Quality (BQ) method is a basic national standard of rock mass classification suitable for different industries in geomechanics and geotechnical engineering in China. Referring to the relevant pr. [pdf]
[FAQS about Performance parameter comparison of Chinese surface rock]
To connect the drill bit with a drill rod you can use an adapter. It is included to kit with each drill bit. The adapter has a ready made thread for drill bit connection. On the other side you can make your thread for. [pdf]
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