Bosch MicroEdge 40724 Wiper Blade - 24" (Pack of 1) Features exclusive DirectConnect one-step installation system. Covers: Pin arm(6.35mm), Hook arm(9x3, 9x4) Enclosed metal tension spring for improved all-season wiping performance Precision-cut natural rubber wiping edge for quieter operation Aerodynamic all-steel frame with clipped joints Exclusive zinc dichromate primer