The replacement cutter head features a double-line design for mowing and trimming. The nylon line self-adjusts by tapping the cutter head on the ground. [Excellent performance] This mower cutting head delivers strong results, even on thick brush and brambles, whether cutting from top to bottom or side to side. [Easy to use] Compatible with Stihl Autocut systems and designed for use with 2.4 mm line. Simple to install and operate, offering reliable performance, durability, and value. Features: Premium quality replacement cutting head compatible with Stihl Autocut C26-2, FS 55, 56, 70, 94, 91, 111, 131, and 240 models. Specially designed with a dual-line configuration for efficient mowing and thinning. Automatic line feed system adjusts the nylon line by tapping the head on the ground during use. Designed for use with 2.4 mm cutting line. Easy to install and convenient to use. Offers high efficiency, durable construction, and long-term reliability. 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