India Abrasive File · Aluminum Oxide · Produces Long Lasting Edges Falcon Tool India Abrasive Files are made of aluminum oxide abrasive which is the preferred abrasive for producing exceptionally sharp, long lasting edges and for high quality steel work. They are brown in color and filled with oil during the manufacturing process. India Abrasive Files are available in coarse, medium and fine grits. Coarse (C) 100 Grit Medium (M) 240 Grit Fine (F) 320 Grit India Taper Three Square Files impart the correct edge in the least amount of time and are used for a variety of deburring, chamfering and radiusing applications. They are designed to retain their shape while achieving a uniform finish. Choose the medium grit file for most of your average tool edge sharpening needs and the fine grit file when a sharper edge is required. Available in a 1/2" x 1/4" x 4" size. Although oil-filled, we recommend using an oil such as our Stoning Oil or Polishing Lubricant and Diamond Thinner for best results as the use of oil increases the sharpening action and minimizes the clogging of the stones' surface.