1.Function - Lawn mower blade sharpener could be used for sharp mower blades to make the blade sharp again. Using in sharpening lawn blade, lawn tractors, mower, rototillers, drill blade,sickle bar cutteretc.^ 2.Advantages - Fast, automatic, easy, safe, saves time and effort.Mower blade sharpener can simply attach to power drills and sharpen the blade easily and quickly.Making the edge become more effective (Saving time and effort, safer)^ 3.Material - The thickness of grinding wheel is 0.78 inch,thicker than ordinary grinding wheels.Made of corundum, high quality, durable, long service life, blade sharpener can be used repeatedly. (high quality, Can be used many times)^ 4.Size - 55 x 50 mm for each one. The are small enough that they fit in tight spaces and rugged enough to sharpen your bladesSuitable for most power drills and hand drills.^ 5.Simple operation- Both the drill and the hand drill can use it to set each tool edge to a 25-degree cutting edge. Then you can sharpen the blade quickly and easily.^ 6.Package includes- totally 4 pieces mower blade sharpeners in package, that are nice sharpen Lawn mower blades with power drill.