Mechanical driving,hydraulic feeding,Drilling hole for water exploring and injection,gas exploring,geological exploring,bolting Three models (ZLJ-250, ZLJ-350 and ZLJ-650) of these products;It is characterized by small dimension, light weight, reliable performance, perfect structure and easy operation and maintenance.PARAMETERZLJ-250ZLJ-350ZLJ-650DRILL DEPTH(m) 75100200DRILL HOLE DIA(mm) Φ50~Φ89Φ ...