Features: . A worn or dull mower blade tears the grass, not cuts and damages the ends, which causes the grass to lose its healthy shine. If you've noticed that the ends of the grass turn brown when you cut through your lawn, you may need a lawn mower sharpener. The lawn mower blade fits into a standard drill chuck and couldn't be easier to use. We recommend using a corded drill bit for best results, but cordless drills with a fully charged battery will also work. The grindstone is perfectly shaped, allowing for a precise and optimal cutting angle of mower blades. Note: when sharpening the blade of an electric lawnmower, the blade may be sharpened while it is still attached to the lawnmower, provided it is properly secured. When sharpening the blade of a gasoline lawn mower, we recommend removing the lawn mower blade and securing it in a vise position, as this grindstone will create sparks. Specifications:Set of 2 SharpenersShank Diameter: 6.35mmSharpening Stone Diameter: 51mmGrit Size: 80gMaximum Speed: 4500 RPMPackage Contents:2 ×Lawnmower SharpenerNote:1. The actual colors of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.2. Please allow slight manual measurement deviation for the data.