Material: Our knife sharpening kit comes with an angle guide made of plastic inside, which protects your knife from scratches while allowing you to find the perfect sharpening angle. Knife Sharpener Size: The Tumbler Knife Sharpener Aid's compact design makes it easy to use, durable and the perfect addition to your kitchen tools. Easy to Use: Just fix the angle guide to the blade in place. Hold the handle and back of the knife so that the ceramic part touches the surface of the whetstone or diamond. Set the blade to a fixed angle and apply gentle pressure to move the blade back and forth on your outdoor portable knife sharpener. Package Contents: The package contains 2 pieces of knife sharpening guides, black, enough for daily use. Practical Tool: This professional guide to knife sharpener is perfect for outdoor or kitchen use. It has a wide range of applications, making it a practical, lightweight and portable accessory.