The chestnut knife is used for scoring chestnuts before roasting, and for removing the shells after roasting. This classic rosewood handled tool has a 1-inch curved blade that conforms to shell contours for ease of scoring in a crosshatch pattern. Chestnuts should be scored widthwise and roasted in a 350 degree oven for 15 to 20 minutes. Lifetime warranty. Made in U.S.A. Lamson & Goodnow LLC # 32425