... mm 2. Galvanized zinc steel frame reduces corrosion.3. Aerodynamic, low profile, low lift design.4. Streak-free wiping.5. No chattering or ... .9. SIze available:10",11", 12", 13", 14", 15", 16", 17", 18", 19 ", 20", 21", 22", 23", 24", 26", 28 ...