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12T Carbon Steel Needle File Set,Surface quenching hardness of HRC 62-64 ✭ Black Color Is A Natural Result From Higher Carbon Content & Tempering ✭ LONG LASTING TEETH Precision Milled Tempered & Coated For Durable Cutting & Filing Performance ✭ BEST ASSORTMENT SET Shapes, Sharpens & De-Burrs Hobby Models, Jewelry, Clocks, Watches & Soft Metal ✭ NONSLIP HANDLE CONSTRUCTION Better Control & Handling Both Wet Or Dry w/ Contoured Ergonomic Handhold Product Quality Problems, Can Be Unconditional Refund Within 90 Days PACKAGE CONTAINED WITHEIN 5FILE SET Filing Best Practices Do not try to file hardened steel with a (hardened steel) file; you will quickly ruin the file. Also diamond-embedded files should not be used on soft materials, including many softer steels, as this will cause the diamonds to be torn out. Clean out any bits of file metal with a stiff wire brush. Chalk/oil/lard the file: rub a small amount of lard/oil into the teeth of the file to: 1. Make cutting easier from the loss of friction of metal on metal 2. Remove the chance of having pins form and stick in the teeth 3. Keep the metal dust down making cleanup and breathing much easier 4. Rust protection on the piece and the file itself. If using Lard or Oil, don't forget if you need to do work that requires the surface to be clean of it. HEAVY CROSS FILING: for course work, grab the handle of the file handle with one hand and place the palm of the other hand on the end of the file. Remove downward pressure on the return stroke so you don't dull the file. LIGHT CROSS FILING: for detail work, grab the handle of the file with the dominant hand and place the fingers of the other hand on the end of the file.