1.Material : Metal 2. Function : Protect 3.Diameter : 40mm, 60mm , 80mm , 90mm,120mm, 172mm,200mm,220mm etc. 4. Dust removal rate: 95% 5.characteristic: reliable welding, smooth surface , anti-corrosive, does not rust and easily clean. 6.Application: For air condition , cooling fan , motor , exhaust fan , radiator , computer , ventilation protection .