Overview :
Suitable for guided drilling in the soft soil formation .
Different pilot plates and alloy materials can be flexibly selected according to the specific geological engineering , thus effectively promote the consrtuction effciency.
Two types of pilot bit, the first form :with the octagonal connection which passes the torque ,prevents damage or seizure of the thread connection , facilitating disassembling of the pilot bit , the second form :without the octagonal connection.
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