... diamond core bits which are commonly used in mineral exploration, site investigation and water well drilling. We have impregnated diamond type, surface set type, electroplated diamond ... HMLC, LTK48, LTK60,EWK, AWK.Note:Impregnated Diamond Core Bit:Impregnation Depth: 6-12mm; 6mm is ... profile, "Semi-round" profile, "Cross" profile...Surface Set Diamond Core Bit:Bit Crown Profiles: "Semi-round" profile, " ...