LARGE PACKAGE: Package contains 4 lawn mower knife sharpeners. Good helper when cutting lawn mowers and lawn tractors. Efficient tools: ideal for sharpening lawn mowers, drill knives, mowers, bar cutters, tillers, etc. to make the cutting edge more efficient. High quality materials: The sharpener is made of brown corundum and the balancer is made of plastic, which is not easy to rust, durable and corrosion resistant, and can be used without hesitation . Easy to use: Installation only takes 10 seconds. All you have to do is install the sharpener on the electric drill. It can be checked through different openings on the balancer. Grind the most suitable slice. Simple and practical: With this lawnmower sharpener, you can sharpen the knife quickly and easily. Cleaner cuts and finer newspaper clippings make the lawn healthier, faster and mowed less. It can save your time and energy, a very practical tool for daily life. Note: The data is manual measurement, please allow 1-30cm error, due to differences between light and screen, there will be a certain color difference, the specific received in nature prevail.