Check the listing for details. 4-In-1 Longzon [4 Stage] Knife Sharpener New In Box. Condition: New, Made in China. Listed at 4.50 USD. The 4-In-1 Longzon Knife Sharpener is a versatile tool designed to keep your knives in top condition. With its 4-stage sharpening system, this knife sharpener ensures a precise and efficient sharpening experience. The Longzon brand is known for producing high-quality kitchen tools, making this sharpener a reliable option for maintaining the sharpness of your knives. Ideal for home cooks and professional chefs alike, this new-in-box sharpener is a must-have for anyone looking to keep their knives in excellent condition.