Optimized Power for Residential Trimmers: Specially engineered to maximize cutting power without bogging down engines up to 25cc. Provides a consistent, reliable cut that is perfect for homeowner-grade string trimmers. Tough Nylon Blade Durability: Stop wasting time with flimsy line. These tough nylon blades deliver high durability and impact resistance, allowing you to slice through tall grass, weeds, and brush where traditional line fails. Guaranteed Dual-Head Compatibility: Authentic Grass Gator 3610 replacement blades guaranteed to fit both the popular Grass Gator 3600 head and the robust 4700 Rampage head. Tool-Free Installation: Features a simple design that allows the blades to slot right on to your trimmer head quickly and easily. Enjoy a fast, tool-free installation that keeps your work flowing without the hassle of winding string. Maximum Value 9-Pack: Each package contains nine rugged, long-lasting blades, providing three full sets to keep your line-free weed trimmer accessory running at peak efficiency all season.