High quality material: Made of high quality solid billet aluminum, durable and long service life. The surface is anodized, anti-corrosion, not easy to rust, perfect for outdoor use, and this chain sander is small and light, which makes it easy to carry. Unique design: Compared with the electric chain grinder, it is more economical and practical. It comes with 3 grinding heads, enough for one use. Manual crank design, it is easier to grasp the grinding degree of the chain. It is small and can be carried anywhere. Use it to sharpen chainsaw chains. The chainsaw can clean dull chains again in 3-5 seconds Precision grinding: The ratchet locks the cap to hold the teeth in the same position, ensuring precise positioning. Each time you sharpen the chain, simply pull the chain. Precision ground to ensure every tooth is restored Easy to use: Easy to use as a pencil sharpener; Equipped with a key, simply attach the chain sharpener to the chainsaw and adjust it to the position where you want to sharpen the chain. There are gears on the side of the chain grinder that can be turned to adjust the tension. After fixing, shake the handle of the chain grinder to start grinding the chain, which is simple and easy to operate.