Usage Tips:Product Color:4 PackColor: Navy blueSpecification:Size: 55 x 50 mm1.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, , durable, long service life, blade sharpener can be used repeatedly. (, 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.