Material: Made of high-quality corundum, durable and long-lasting. The grinding surface is quite rough, allowing the blade to be sharpened quickly and easily, saving time and effort. Dimensions: Blade sharpener: 50 x 47 mm / 1.97 x 1.85 inches (DL) (fits most drills), Balancer: 6 x 5 cm. Packaging: 4 pieces red lawn mower blade sharpener + 1 piece balancer. Note: The weight of a single lawn mower blade is 70g. Therefore, please be careful when using it! Key Features: With this lawn mower blade sharpener, you can sharpen the blade quickly and easily, reducing sharpening time. It saves time and energy and is a very practical tool in everyday life. Easy to use, suitable for most electric and hand drills, it can sharpen the blade quickly and easily, and the blade balancing design fits 99% of all center holes. Ideal for sharpening lawn mowers, drills, sickles, cultivators, garden tools, and art tools, but not for sharpening serrated knives or ceramic knives.