Durable Materials: The lawn mower sharpener is made of corundum whetstone and steel, which is strong and durable, not easy to wear, not easy to deform, you can reuse it many times. Effective Tool: This sharpener can be used with electric drills and hand drills to easily and quickly sharpen garden tools, saving you time and effort. Wide Application: The lawn mower sharpener is suitable for outdoor, home and garden lawn care. Can be used to sharpen a variety of gardening tools such as lawn grinders, lawn mowers, sickles, tillers and more. Package Contents: You will receive 3 lawn mower sharpeners, overall size 57 x 63 mm (2.2" x 2.5"), 7 mm (1/4") hex shank.