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Defining Curl Tools - Curls, hinges, rolled edges and knuckles. All of these are terms used to describe a curl form on sheet metal. Regardless of what the curl is for, the tools used to make them all function in similar ways. Why then, are there so many different types of curl tools available? We can answer this by looking at a number of curl tools and identifying the differences between the materials used, the number of steps and setups, and the curl each one creates.