The circular shield role: protection screw, light bars, columns, spindles and other round rotating cylinder can be used to. Can be used horizontally or vertically. The level of use is recommended to use plastic or aluminum support ring, keeping guard uniform distance between the cavity and screw and prolong life. Stretching the length in each compromise with metal ring to improve the shroud stable site www.ysjrjcfj.com the sexual. Or commonly used metal flange fixed end ferrule type, you can choose.