Wet grinders are generally used for grinding food grains and lentils to produce a paste or batter. It is generally used to make the batter for idlis, dosas, chillas, vada, etc. These grinders generally consist of a few granite stone plates that are rolled against another stone plate to ground the ingredients between them. Wet grinders have two advantages over electric mixers or blenders. First, the stone grinder generates less heat than a mixer; heat affects the flavour of the food. Second, the stones remain sharp for a longer time than metal blades.