Bosch Evolution 4813 Wiper Blade - 13" (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: Pin arm (4.8mm), Hook arm (9x3 & 9x4), Side lock (22mm)