Check the listing for details. PPP Premium Whetstone Knife Sharpener Kit. Condition: New, Made in United States. Listed at 75.00 USD. The PPP Premium Whetstone Knife Sharpener Kit is a high-quality sharpener designed specifically for knives. Made in the United States by PPP, this kit includes everything needed to keep knives in top condition. The whetstone provides a durable and efficient sharpening surface, making it suitable for all types of knives. With this premium sharpener kit, users can easily maintain the sharpness of their knives for a longer period of time, ensuring precise and effortless cutting every time. 6000/1000 double sided stone.