Surface Set Diamond Core Drill Bits , Backfilled Stratum Shale Diamond Drill Bit Set

NQ NQ3 HQ HQ3 Surface Set Diamond Core Drill Bit for Drilling Broken and Backfilled Stratum Shale Surface Set Diamond Bit Roschen surface-set diamond bits are set with a singular layer of natural or synthetic diamond utilizing a hard matrix compound on the face of the bit. The diamond set design ensures sufficient overlap to prevent premature wear of the matrix. Surface set diamond bits are primarily recommended for use in drilling relatively soft, abrasive, unconsolidated