Abrasion Resistant: The AF100 trimmer spool is made of improved nylon polyamide material with a tensile strength of over 45kg, offering 30% greater durability than other brands for extended lifespan. Easy to Install: The spool is designed to fit the compatible trimmer model perfectly, ready to use and can be installed quickly without tools. Easy to Use: The weed eater spool compatible with Black and Decker models features an automatic feed mechanism powered by centrifugal force, reducing the need for manual line adjustment during operation. Professional Quality: Designed for reliable performance and long-term use. Package Includes: 12 packs of AF100 thread spool (1.65mm, 9m per piece), 3 caps, and 3 springs. Compatible with Black & Decker grass trimmer models: GL280, GL301, GL425, GL430, GL545, GL555, GLC13, GLC2500, GLC2500L, GLC3000, GL4525, GL4525SB, GL5028, GL5028SB, GLC1423L, GLC1825N, GLC1823L, GLC1825L, GLC3630L, ST5530, ST4525, STC1820, STC1815, STC1820PC/EPC, STC1840/EPC, ST1823.