The replacement cutter head features a special double-line design for mowing and thinning. The nylon line self-adjusts by tapping the cutter head on the ground. [Excellent performance] This mower cutter head delivers strong cutting results, even on brambles, whether mowing from top to bottom. [Easy to use] Compatible with Stihl Autocut systems and designed for use with a 2.4 mm line. Simple to install and operate, built for durability and reliable performance. Features: Premium quality replacement cutting head compatible with Stihl Autocut C26-2 FS 55/56/70/94/91/111/131/240. Specially designed with a double line configuration for efficient mowing and thinning. Automatic line adjustment by tapping the head on the ground during use. Designed for use with 2.4 mm cutting line. Easy to install and convenient to operate. Durable construction for long-term use. Specifications: Condition: New Material: Plastic Color: As shown in picture Diameter: approx. 15 cm Bottom Thread Hole Size: 10 x 1.0 mm – Left Hand Thread – Right Hand Shank Package List: 1 x Cutting head