Molds, as well as advanced and contemporary plastic molding machinery, play an important role in making of a high quality product. Molds are usually made of metal sheets, stainless steel sheets and aluminum. Molds made with metal sheets are usually used for products with simple shapes and high demands like water tanks. Stainless steel sheets are used for products with specific surface finish required. Aluminum molds are used for asymmetric products with steep and varying angles.