Compatible with Bosch trimmer models: Bosch/ART30-36L, AdvancedGrassCut36, ART24, ART27, ART30, ART24+, ART27+, ART30+ (from 2016 onwards). Aerodynamic oval design reduces air resistance. Replacement spool type: Bosch F016800351. Replacement cap type: 1600A00X61. High-quality material: The replacement spool for Bosch F016800351 is made of high-performance plastic, safe and environmentally friendly. The nylon line is made of premium nylon imported from Germany. Flexible and durable operation: The replacement spool uses centrifugal force and aerodynamics to reduce air resistance for faster cutting. Professional CNC spool: The replacement spool for Bosch F016800351/1600A00X61 is cut and wound by a CNC machine with automatic wire feeding. The Bosch F016800351 spool has a line length of 6.1 m (20 ft), spool width of 5.5 cm, height of 2.35 cm, and line diameter of 1.65 mm. The trimmer cover has a diameter of 7.5 cm and a height of 3.3 cm. Easy installation: 1. Turn off the engine, remove the cover, and clean out dirt and old spool. 2. Thread the line through the slots in the spool. 3. Press down the spool and rotate it into the correct position. 4. Reinstall the cover and check that everything is secure. Note: 1. When using this product, take protective measures to avoid injuries from flying debris. 2. It is recommended to wear safety goggles and long pants while trimming to prevent accidental injuries.