Feature
Option half-automatic or manul mechanic bottom open system. Buit-in ventilation pipe;
Cast pilot with rock drilling bits , arc guide plate teeth arrangement, double unlocking system;
Staggered arrangement of rock drilling bits;
Applicable layers: gravel , pebble , highly or medium weathered rock;

Customizable Items
Cutting DIA. Custom : design various cutting diameter based on demand, such us 0950?01050 etc.
Shell HlT. Custom : design as demand, prolong or shortten, increase amount of per drilling, improve efficiency.
Small barrel facilitates the coring operation; large barrel performs stage breaking;
Cutter Custom: single cutter and double cutter design as demand;
Kelly Box Custom : custom kelly box size based on the kelly bar, like 130*130, 150*150,200*200 etc;
Bottom Open Mechanic : half-automatic or manul mechanic bottom open system.