Extend the life of abrasive files and sheets with this handy tool Clears clogged hobby files (metal files too) and sheets of metal, wood and plastic residue without damage or dulling. Measures 2′ 5cm in diameter x 1/4′ 0.6cm thick.WARNING: Drilling, sawing, sanding or machining wood products can expose you to wood dust, a substance known to the State of California to cause cancer. Avoid inhaling wood dust or use a dust mask or other safeguards for personal protection. For more information go to www.P65Warnings.ca.gov