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Diamond matrix provides 350x the life of conventional abrasives and aggressive material removal Large grinding segments with heat treated steel bodies that provide increased durability and wheel life 4 1/2\; Product description Extended performance diamond matrix provides 350x's the life of conventional abrasives and aggressive material removal;Large Grinding segments with heat treated steel bodies which provides increases durability and wheel life; Product description Extended performance diamond matrix provides 350x's the life of conventional abrasives and aggressive material removal;Large Grinding segments with heat treated steel bodies which provides increases durability and wheel life; Extended performance diamond matrix provides 350x's the life of conventional abrasives and aggressive material removal;Large Grinding segments with heat treated steel bodies which provides increases durability and wheel life