Feature This is a New Ball Type Arch Trimmer ,which is innocated by our self independently ,obtains the national invention patent ,changes the traditional polishing way . it sspherical machine part can work at 0-40degree design incline , metting all the requirements of different work ways and angle requesed ,with sharpeness and wear -resisting the tungsten steel wheel head ,and the independent illumination LED . There is no dust after connecting with dust collect hose .