DMT FCS6C 6/32" Diafold Diamond Chain Saw File - Coarse Superior diamond sharpening stones Legendary quality Made in the USA Portable, lightweight with convenient fold & go handles which enclose and protect the diamond chain saw file when not in use Coarse diamond to transform a dull edge. Sharpens knives faster than conventional stones with DMT's monocrystalline diamond surface No oil is needed-sharpen dry or with water Durable construction will provide years of consistent performance and reliable service