... 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 ... us for inquiry.Size Available: Q series: AQ, BQ, NQ, HQ, PQ,BQ3, NQ2, NQ3, HQ3, PQ3...T2 ... HWTOthers: NMLC, HMLC, LTK48, LTK60,EWK, AWK.Note:Impregnated Diamond Core Bit:Impregnation Depth: 6-12mm; 6mm is "Forsun" ...