Overburden Drilling Tools ODEX systems for DTH hammers that are specially designed to drill and case simultaneously through overburden. These durable overburden drilling tools easily pass through large boulders for pulling lightweight wherein inexpensive casings are incorporated behind them. These overburden drilling tools are easy to remove from the hole/ depth and are provided to our clients in the following technical specifications: Size: ODEX90, ODEX115, ODEX127, ODEX140, ODEX152, ODEX165, ODEX190，ODEX240 1. Applied to the drilling where the rock formation is overburden and need casing tube to support. 2. flexible to open and close. 3. Application Range: It is suitable for drilling water wells, geothermal wells, and short miscopies medium mini-type grouting hole of building, dam and harbors project. 4. Design Principles: Make the casing follow easy and the equipment and operation simple 5. Outstanding Advantages: Simple structure, simple operation, reliable quality, retrievable drilling tools, long service life. 6. Inner package with cartons, outer package with wooden cases