Commercial Panini Grills, often called a Sandwich Grill or Press, have a hinged top so that you have a two sided grill to make sandwiches faster. Plates may be grooved or have a smooth cooking surface. Some have a floating hinge which allows you to adjust the height of your press. Panini Grills are versatile and are good for more than sandwiches. They can be used for steaks, burgers and vegetables. Plate material vary from aluminum, cast iron and no stick coated.