efficiency: Quickly restore blunt lawn mower blades to sharp condition, improving cutting performance and reducing downtime during mowing. Double layer corundum material: Each sharpening stone features a durable double layer of corundum, designed to withstand heat during grinding and maintain shape without damage. 10 pieces: Includes a total of 10 doublelayer sharpening stones for replacement and ongoing sharpening needs. Easy installation: Simply attach the sharpening stones to a power drill and sharpen blades quickly and with minimal effort, achieving sharper edges. Use scenario: Prepare for the mowing season by refreshening dull blades for cleaner cuts and better power efficiency. Use scenario: Perform routine maintenance between uses to extend blade life and maintain cut quality. Use scenario: Suitable for professional lawn care where multiple blades and rapid sharpening are needed for quick stone swaps to keep tools ready.