Norpro Strawberry/Tomato Corer Essential tool for those who process tomatoes or strawberries for canning. Significantly cuts down prep time and much easier than using a paring knife. Stainless steel teeth and durable, heavy duty plastic. Effortlessly core your tomatoes and strawberries without mangling fruit. To use for tomatoes: Insert teeth of corer at stem and twist out. To use for strawberries: Hook stem off with teeth of corer.