National Cycle Replacement Screen - 16,50in. - Clear/Quantum Coated N20052 Extra-large windscreen made from 6mm thick Quantum&trade; hardcoated polycarbonate Windscreen vent is pre-installed Pre-treated with National Cycle&rsquo;s new RainZip&reg;, the ultimate rain repellent Retains full OEM windscreen adjustability Offered with or without a vent hole &ndash; uses OEM vent/hardware (not included) or National Cycle&rsquo;s 562-5001V Replacement Vent