Compatible with several models of Black Decker mowers: GL110, GL320, GL325, GL300, GL200, GL220, GL225S, GL420, GL280GL301GL425GL430GL545GL555 GLC2500LGLC3000GL 4525GLC1423LGLC1825NGLC1825L(20)GLC3630LGLC1823L(20)ST1820 STC1820CM, SSTC51820PC/EPSTC1840 Auto Feed Spool: The Eventronic replacement spool compatible with Black and Decker weed killer is easy to use, automatically feeds the trimmer by centrifugal force, reducing the drudgery of manual spare spool sorting while working. Abrasion Resistant: The Eventronic BLACK+DECKER Weed Trimmer Compatible Trimmer Cord is constructed with an improved polyamide nylon material that has abrasion resistance. pulls over 100 lbs and is 30% more durable than other brands for longer life. Efficient Cutting: The Eventronic Trimmer Spool Line compatible with Black Decker is bendable and flexible, allowing the line to stretch and cushion impact with hard surfaces, and increases cutting efficiency by 50%, allowing each spool to cut more weeds. . The package contains 8 spare spools compatible with Black and Decker, 1 spool caps, 1 springs.