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Discs
Often cutting discs or (cut-off wheels), are made from a solid abrasive disc. These discs are often used for cutting metal; they are composed of an abrasive mix of grit and adhesive that is formed into a rigid and thin disc with fiber webbing running through it for strength. Some discs used for cutting ceramic tile or stone are made from a solid disc with an edge coated with a diamond grit. The most common size for these cutting wheels is  4-1/2 inches in diameter, however they cn range from 2 to 16 iches in diameter with a thickness range from .045 in to .125 in. Type 1 discs are flat, and type 27 discs have a raised hub. These wheels are strong, but not immune to breaking, if a cutting wheel breaks while in use, fragments could injure the operator or a near by co-workers. To avoid breaking cutting discs, never exceed the maximum speed (RPM) specified on the disc, and do not overload the disc by cutting with excess force or jamming the wheel into your workpiece.

Applications
Many manuel cutting tasks require a hand-held grinder using a cutting wheel. Metal fabrication is one of the most common uses for cutting wheels. Used to cut sheet metal, sizing metal stock for welding, cut a weld to re-weld it, and cutting and notching steel pipe are just few examples. Die grinders and chop saws are also common tools used with cutting discs.