... in the depth of impregnated bit's matrix series. The matrix layer of the crown contains a uniform ... are embedded in a powdered metal bond.The matrix of our impregnated bits is designed to expose ... a minimum.The optimum diamond size, concentration and matrix type are dependent on the hardness and abrasiveness ... When order, please read .Size Available: "Q" series:AQ,BQ,NQ,HQ,PQ/AQTK,BQTK,BQ3,NQ2, ...