Overburden Casing System, also named Eccentric Casing System, is suitable for drilling water wells, geothermal wells, short mircopiles, medium mini-type grouting hole of building, and diamond harbour projects.

Economy: Eccentric is the most economical solutions because its ingenious reaming wing allows the bit to be retrievable and used at the next hole.

When drilling, the reamer bit will rotate out to enlarge the hole enough for the casing tube to slide down behind the reamer. Upon reaching the required depth, the drill pipe will drill in the reverse direction, causing the reamer bit to retract. This allows the entire drilling system to pass through the casing.

• High grade tungsten carbide inserts.
• Bit bodies manufactured from high grade steel processed using state-of-the-art CNC machinery and advanced heat treatment.