PFERD Diamond Needle File Set DF 4205 D 126 // The diamond needle file sets are supplied in a practical, durable plastic box which protects the files from damage. This box is optimal for storage, for example in a tool box or workbench. Diamond needle files are universally usable in tool making. // Grit size: D 126 // Total length: 5-1/2 inch // Coating length: 2-3/4 inch // Contents: DF 4112 (hand), DF 4132 (three square), DF 4142 (square), DF 4152 (half-round), DF 4162 (round) // Materials that can be worked: hardened steels, tungsten carbide, ceramic, glass, ferrite, nickel- and titanium-based alloys, fiber-reinforced plastics (GRP/CRP) // Applications: leveling, deburring, surface work, edge work, edge work (chamfering, rounding), removing oxide layers, cleaning, fine finishing // Recommendations for use: Apply only slight pressure to the file, especially on edges. Soiled diamond files can be cleaned in kerosene or anti-static plastic cleaner with a file brush. Alternatively, ultrasonic cleaning is also possible. Often it will suffice to knock the file against a hard object. Avoid contact with grease when using files!