ECOGARD XV21 Vision Premium 21&rdquo; Wiper Blade &ndash; Universal-Fit Conventional Design (Pack of 1) INCLUDES ONE EASY-TO-INSTALL BLADE that is a universal fit for 21 wipers; with original-equipment-quality adapters that fit 9x3 and 9x4 Hook Arms, Side Pin, and Bayonet connections. See provided diagram for details. ECOGARD VISION SERIES has a premium conventional all-steel frame with stainless steel riveted joints to resist corrosion and provide long-term durability that stands up to extreme weather. SUPERIOR WIPER BLADES ARE RATED FOR ALL-WEATHER PERFORMANCE and help reduce hazardous driving by delivering a consistent streak-free wipe across the entire sweep of the wiper arm, even in the heaviest of rains. HINGED-FRAME DESIGN keeps the entire wiper blade pressed against the windshield to avoid wind lift, chatter and streaking. SPECIAL GRAPHITE-COATED RUBBER ENSURES SMOOTH AND QUIET MOTION. Graphite-coated rubber reduces friction on the glass, which promotes a longer life of the squeegee, lessening noise and chatter during use.