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 Reamer Stones are available in medium and fine grits. Medium (M) 240 Grit Fine (F) 320 Grit India Reamer Stones are shaped to impart a professional edge on reamers and taps. Durable and fast cutting, these stones deliver a fine finish and a long lasting edge. India Reamer Stones are available in medium and fine grits to meet all of your specific surface finish needs. Available in a variety of sizes. 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.