[HIGH QUALITY ]- Material: Stainless Steel + Grindstone,Maximizes cutting performance and gives you a sharp edge in minutes. [PACKAGE & SIZE ]- 50 x 47 mm/1.97 x 1.85 inch for each one.packaged include 4 pack lawn mower blade sharpeners with free Blade balancer.Ensures safe, vibration-free operation [WIDE APPLICATION] - It 's a good helper for lawn mower and lawn tractor' blades.Widely used for sharpening lawn blade, drill blade, mower, sickle bar cutter, rototillers, and so on. [EASY TO USE]-It can be easily attached to an electric drill and then sharpen your mower blade, a very practical tool in everyday life. [100%GUARANTEE SERVICE]-Satisfying customers is our top priority. If you have any questions, you can always contact us. 12 months warranty service and customer service response within 24 hours.