Bosch Evolution 4839 Wiper Blade - 20" (Pack of 1) Symmetrical wind spoiler uses air flow to increase blade-to-windshield contact and shields tension springs from all weather elements for exceptional performance in even the worst weather Patented bracketless design better resists ice and snow build-up for better performance and visibility in all weather Precision-tensioned dual steel springs create tension memory, applying uniform pressure along the entire blade length for crystal-clear visibility Precision-cut, specially blended natural rubber wiping edge removes even the smallest droplets for clear visibility and safer driving Double locking connector provides quick and secure connection. Covers: Pinch tab, Top lock (19mm)