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Maintenance: A dull cutting edge may be sharpened using a common file as described in our "Maintenance" section below: 1. Always wear safety goggles when sharpening a cutting edge and when ever using a striking tool.2. Rigidly support the tool being sharpened. Secure in a bench vise if possible.3. Never use grinding to sharpen. This causes excessive heat and may result in a loss of strength, durability and temper.4. Instead, use a file or stone of medium or fine grit and file away from the cutting edge. This directs heat away from the edge.5. The original contour of the cutting edge or point should be restored. Flat cold chisels should be restored to a bevel angle about 70 degrees. Note: Always strike the chisel with a light, cautious blow when starting a job to determine the relative hardness of the metal to be cut. Always wear safety goggles when using a cold chisel as well as when using all struck hand tools.. From Factory: The chisel has a cutting edge at one end, and a struck face at the other to be struck with a ball-peen or machinists hammer. Never strike with a nail hammer and never strike anywhere except the struck face.