46 Abrasive Files Norton abrasive files hold their shape while   imparting the finest, most uniform finish on   precision machine parts and in tool and die   making .   Abrasive files are ideal for any   deburring, chamfering or radiusing job, or for   fitting delicate parts .   Select the file shape that matches the contour of the surface being stoned . Choose one or a sequence of benchstones to restore a cutting edge .. • Use oil – For best benchstone performance to keep stones free cutting, with no loading or gumming, use stones with oil . – If stones do gum - up or load, clean with kerosene . • Use of stones on flat tools – Flat - bladed tools require flat stones . All benchstones (except diamond) can be flattened by rubbing on waterproof sandpaper against a flat surface . • Use of stones on round or shaped tool – Shaped tools require shaped stones .           – Select an appropriately - shaped abrasive file or slip . • Maintain correct tool edge bevel angle •   Many knives and tools have 2 bevels: – The blade bevel (the back of the edge), once correctly set, is seldom sharpened . – The edge bevel does the cutting – and requires sharpening to 15 to 20 degrees . – Too acute an edge bevel will weaken, dull quickly and breakdown .           – Too obtuse edge bevel will not cut properly . • The final step • Sharpening often leads to a minute burr (wire edge) on the tool . • Remove this by “stropping” the tool on leather or hard wood for the best cutting edge . It is the user’s responsibility to refer to and comply with ANSI B7 . 1 Abrasive Files Features & Benefits: Crystolon Files Fast - acting silicon carbide products, Crystolon files are designed for use where moderate tolerances are acceptable . India Files India files are ideal when a close tolerance is more important than the speed of cut . Hard Arkansas Files Hard Arkansas has an ultra fine grit that produces the finest edge possible while maintaining tolerances unequalled by any other abrasive file .   It will also produce a highly polished finish .