Half-Round-Diamond-File-1-4in-DMT-C00-p-Diamond-File-Crystal-Saver-smoothes-sharp-jagged-edges-on-any-glass-p-p-Simply-moisten-the-file-rub-back-and-forth-with-the-round-side-in-recessed-edges-and-then-with-the-flat-side-on-sharp-raised-corners-p-p-Generally-only-a-few-strokes-are-needed-br-325grit-p-DMT-C00-Half-Round-Diamond-File-1-4in