1. The lawn mower blade sharpsener is suitable for various power drills and hand drills. It is convenient to use and high in efficiency. Designed to be mounted in any 1 or 4" drill. 2. The mower sharpseners feature a perfect rotary balance design, which makes cutting edges quick and easy, saving time and effort. It is easy to use and high in efficiency. 3. The sharpsener is made of high-quality grinding stone, which is sturdy and durable, which makes the cutting edge of the lawn mower clean and sharps. 4. Balancing Your Blades When Sharpening Reduces Engine and Spindle Bearing Wear. 5. Works on most mowers without removing the blade. 6. Drill Mountable Blade Sharpener Cuts The Correct Angle. 7. It is a efficient tool for sharpsening lawn blade, drill blade, mower, sickle bar cutter, roto tillers, hoe and so on, make the edge become more effective. Specifications: Material: Corundum. Model: 4 Layers, 2 Layers Size: As the picture Diameter: 55mm or 2.1" Shank Diameter: 6.35mm or 1 or 4" Package Included: 1 x Lawn Mower Blade Sharpener