AutoTex M5-21 M5 Traditional Metal Windshield Wiper Blade - 21" (Pack of 1) Pre-installed connector fits 9x3 hooks arms. Included adapter fits 9x4 hook, 1/4" and 3/16" pin, and bayonet wiper arms All-steel frame for durability Aerodynamic frame prevents wind lift Rust-resistant stainless steel spline ensures rubber element is secure to the frame DuraTex advanced rubber compound is compression-molded, 100% natural rubber