3 Ltrs Wet Grinder is used to make pastes from grains and lentils, such as those used in cooking dosas and idlis in South Indian cuisine. These grinders generally consist of a few granite stone plates that are rolled against another stone plate with the items to be ground between them. 3 Ltrs Wet Grinder is used to grind scraped coconut, soaked grains, lentils, etc. into a fine smooth paste. These are designed for grinding in large quantities.