Our drilling tools and drilling rigs are used in varied ... leading exporters of Premium-quality drilling rigs and drilling tools in China, we produce full range of core drilling ... rig and core drilling tools in DCDMA standard, CDDA standard, and Boart Longyear ... 1600m. 2. Various mud pumps; 3. Diamond core drilling tools including: A. Diamond core bits (AQ, BQ, NQ, HQ ...