[Practical Design]the guide tube is inclined at 30° to better fit the chain tooth mouth: the new design allows the slider to move by rotating the side button so that the grinding head firmly fits the chain tooth mouth, No need to take it all apart or replace the chain, can be applied to more complex environments and save your time. It's a very fast way to sharpen your chainsaw. The tool can make work smoother , well worth the money. [Sturdy Material]Chainsaw chain sharpener is made of anodized aluminum fixture, which is not easy to rust. The tungsten steel grinding burr is made of tungsten carbide, which is strong and . They than the hard steel file, and have a longer service life. Hexagonal grinding head can be also applied to electric grinding [Widely Compatible]Chain saw sharpeners work together with most 4-22 inch chainsaws and electric chainsaws, compatible with different sizes of chains. Such as .325Inch-3/16Inch, .404Inch-7/32Inch, 3/8 Inch P-3/16Inch, 3/8 Inch P-5/32Inch,