... manufactures diamond core bits which are commonly used in mineral exploration, site investigation and water well drilling. We have impregnated ... type in following sizes. Welcome to contact us for inquiry.Size Available: Q series: AQ, BQ, NQ, HQ, PQ, ... BQ3, NQ2, NQ3, HQ3, PQ3...T2 series: T2-46, T2-56, T2-66, T2-76, T2 ... 86, T6-101, T6-116, T6-131, T6-146T6S series: T6S-76, T6S-86, T6S-116, T6S-131, ...