Specifications of the spool: The Uubox trimmer harness is compatible with black spool + Deacker with cover, 30 feet (approximately 9.1 meters) 0 inches (approximately 0.2 cm) of cutting line, can be used with original spool models AF-100, AF-100-3ZP, AF-100-BKP, AF-100-2. Professional CNC spool: Using CNC machinery, the black trimmer spools and bridge spools are automatically cut and wound, preventing jams during cutting. Durable material: The Uubox cutting spool replacement adopts high-quality ABS spool and durable polyamide nylon line, offering flexibility and long lifespan. Utilizes centrifugal force for maximum performance. Usage precautions: Please wear protective eyewear and long pants to avoid injuries caused by flying debris. This product is suitable only for light grass. For thick weeds, please use alternative tools such as cutting blades. Excellent compatibility: Our black and bridge trimmer spools are compatible with GH900, GH600, LSTE525, LST300, BESTA510, LCC340C, LST522, ST8600, ST7700, ST700, ST66600, NST2118, NST2018, N. ST1118, MTE912, MTC220, LSTE525BT, LSTE523, LST420, LST400, LST220, LST201, LST140C, LST136W, LST136B, LST136, LCC222, LCC21, GH912, GH610, GH500, GH400, CST2000, CST1200, CST1000512, BESTA620.