Norton SG Toolroom Wheels for high productivity/low total per-part grinding cost. These wheels feature fast stock removal, cool, superior cutting, providing 3X - 5X more life than aluminum oxide wheels. Norton vitrified toolroom wheels have set the standard for generations - leading the way with technological improvements to maximize performance and productivity. Depend exclusively on Norton wheels for all your toolroom needs. Typical applications include surface grinding, tool and cutter grinding, and drill sharpening. Provide sharp edge on tools and dies for longer life of tools and dies in production. Blue 5SG - Durable SG and aluminum oxide blend for high stock removal rates, excellent productivity, long wheel life, low overall grinding costs. Medium grade (I). Best performance level.