... price 2.BQ NQ NQ2 NQ3 HQ HQ3 PQ PQ3 Surface set diamond core bit Diamond core bits are widely used ... conservancy and power engineering, hydrogeological exploration and building construction, etc. Surface set bit Crown Profiles:1.Semi-roundprofile,2. Stepprofile Size ... , NQ, NQ2, NQ3(NQTT), HQ, HQ3(HQTT), PQ, PQ3etc.T2-46, T2-56, T2-66, T2-76, T2-86, T2-101T6 ...