These are a multifunctional lawn mower sharpening stone, mainly made of alumina. They are durable, have excellent texture, and can serve you well. Manufactured with excellent craftsmanship, wear-resistant, and high grinding strength, it can help you to polish the weeder and make it have better working performance. This is a great polishing and will serve you well. Features -Color:Light Green. -Material:Alumina. -Size: About5.70X4.90X0.60cm/2.24X1.93X0.24inch. -Preferred materials, good quality, safe, durable and practical. -The scientific design makes it have good performance, which can help you easily increase efficiency and save more time. -It can be well applied to most lawn mowers, effectively remove rust, and exert excellent polishing effect. -When grinding, the noise is small and the dust is less, which will bring you a better experience. -You can buy this professional and practical lawn mower sharpener at an affordable price.