Package contains: The package contains 4 cutting sleeves and 4 springs, which can cover your daily replacement and storage needs. High-quality materials: Made of ABS and carbon steel, durable, long service life, good stability, impact resistance, cold resistance and oil resistance. Unique Design: According to special design, the edge can last longer on the rough surface. Aerodynamics can reduce pipe noise and shaking. Easy to install: Easy to install and save the cost of purchasing a new mower. Ideal for patios, lawns, yards, gardens, crops, landscaping, landscaping, etc. Various Applications: Compatible with BLACK + DECKER AFS trimmer models GH400, GH500, GH600, CST1000, CST2000, NST2018, ST7000, ST6600 and ST7700. It is suitable for agriculture and animal husbandry, aquaculture and forestry. Product Description: - Made of high quality ABS + carbon steel, good stability, impact resistance, cold resistance and oil resistance. -Just put the cover on the valve insert, the spring does not make it easy to fall off. The RC-100-P replaces the bobbin cover with which the automatic thread feed bobbin thread cutter is used. -It protects the spool to prevent it from getting dirty. -The valve core cover is very small, light and easy to carry. Technical data: Material: ABS + carbon steel Color: As shown Coil cover size: 8.6 x 3.4 cm / 3.39 * 1.34 inch Nib size: 2.3 x 3.6 cm / 0.906 * 1.42 inch Quantity: 4 pieces Package included: 4 x springs spare parts compatible accessories 4 x spring Note: 1. Due to the different lighting and screen settings, the color of this item may differ slightly from the image. 2. Due to different manual measurement methods, please allow slight size difference.