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The reaming shells can, be used for maintaining, the drilling gauge and, improving drilling stability - details see: https://www.machineto.com/synthetic-diamond-reaming-shells-10079284

Reaming shells are designed to be placed behind the core bits to ensure the size of the hole to maintain and assist the core barrel stabilization. FLYDISC reaming shells are available for all types of core barrels, since the working parts of reaming shells, with a spiral and a parallel design, contains both mono-crystalline and polycrystalline diamonds.