Diamond Grit Porcelain Tile File, Works On All Types Of Tile, Smooths Other Substrates Including Fiberglass, Laminate Flooring, Cement Board & Carbon Fiber, High Quality Diamond Bond Strength Maintains A Tough Grit Surface For Working With The Hardest Materials, Unique Molded Handle Was Created For Comfort & Durability, High Quality Diamond Grit Coating Is Long Lasting & Will Not Chip.