Sharpening stone (abrasive grinding wheel) for slicers, size 64 × 20 × 14.3 mm (diameter × thickness × centre hole). It is the wear part of the built-in sharpener assembly that restores the edge of the circular blade. Large-format "cup" wheel for Berkel slicers: 64 mm diameter, 20 mm thickness and 14.3 mm hole — dimensions noticeably larger than average, to be checked carefully. Medium grit: a good balance between material removal and finishing, suitable for routine edge maintenance. Replace the stone when it is worn out, glazed or no longer bites. Check the three dimensions (diameter, thickness, hole) on your machine: they determine compatibility regardless of brand.