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PCD Nq Hq Pq Reaming Shell for Geological Drilling. Customizable Sizes: Available in BQ, NQ, HQ, PQ, SW, UW and all sizes designed by customers. Diamond Material: Set with natural or synthetic diamond for drilling very hard rock formations. Stabilizer Function: Acts as a stabilizer for the drill bit and keeps core barrel stability. Versatile Application: Suitable for broken, abrasive, consolidated, and non-abrasive formations. Multiple Length Options: Available in 6', 10', and 18' lengths to suit different drilling needs. High Production Capacity: Monthly production capacity reaches 10,000 units. Long Service Life: Physically longer design resists abrasion and extends tool life.