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Multi-purpose fine grain isotropic graphite rod formulated for roughing and detailed EDMing. Provides high metal removal rates with good finish and detail. Tolerance: precision ground finish, +.005/-0 Fine grain isotropic graphite blank formulated for roughing and detailed EDMing. Provides high metal removal rates with good finish and detail. Recommended for making EDM electrodes. Manufacturer Graphtek Item model number EC-12-1855 Is Discontinued By Manufacturer No