Various types of rotary digging drill rod head size
Because the rotary digging into the sea China earlier, there is no uniform B by national standard, but the host plant is basically the same, but the difference is mainly divided into two types of schools: as schools, using standard rotary drilling chassis, the stability is good; 31 schools, using the general excavator chassis, stability has been lacking, but saves cost
Rotary drilling rig in China as long as the same type of drill head size is the same, such as 22 and 31 of the 22 rivers square is the same size
