AQ BQ NQ HQ PQ Impregnated Diamond Core Drill Bits for hard rock Impregnated diamond core bit is made of diamond and steel. It can use in medium hard rocks to hard rocks in geological drilling and mineral mining. Xi'an Heaven Abundant Mine Equipment Co.,Ltd supply kinds of core bits and casing shoe, reaming shell, PDC cutter drill bits etc for more than 8 years. Welcome to purchase quality diamond core bits from our company. AQ BQ NQ HQ PQ Impregnated core drill bit diamond core drill bits for hard rock Size Available as followings: AQ, BQ, NQ, HQ, PQ/AQTK, BQTK, BQ3, NQ2, NQ3, MQTT, HQ3, HQTT, PQ3, PQTT T2 series: T2 46, T2 56, T2 66, T2 76, T2 86, T2 101 T6 series: T6 76, T6 86, T6 101, T6 116, T6 131 T series: T36, T46, T56, T66, T76, T86 Matrix hardness Abrasiveness of matrix Suitable drilling formation Grade HRC Extra soft 10-20 Low Suitable for drilling extra-hard, compact and weak-abrasive formation Soft 20-30 Low, medium Suitable for drilling extra-hard, compact and weak-abrasive formation, extra-hard and medium-abrasive formation Medium-soft 30-35 Low, medium Suitable for drilling hard and weak-abrasive formation, hard and medium-abrasive formation Medium-hard 35-40 Medium-high Suitable for drilling hard and medium-abrasive formation, medium-hard and medium-abrasive formation Hard 40-45 High Suitable for drilling hard and strong abrasive formation Products details AQ BQ NQ HQ PQ Impregnated core drill bit diamond core drill bits for hard rockAQ BQ NQ HQ PQ Impregnated core drill bit diamond core drill bits for hard rock AQ BQ NQ HQ PQ Impregnated core drill bit diamond core drill bits for hard rock Packaging & Shipping Packaging for AQ BQ NQ HQ PQ Impregnated Diamond Core Drill Bits for hard rock is in carton box, one piece is in one box; 1-5 days for sample, batch products depend on order quantity; Samples will be shipped by express, batch products will be shipped by air or by sea.