Product descriptionQuantity of items in the package: 10[Fits several models of Black + Decker trimmers]: LCC140, GH400, GH500, GH600, GH610, GH900, GH912, ST6600, ST7000, ST7200, ST7700, ST7701, ST8600, ST9000, CST1000, CST1100, CST1200 and more1. [Compatible with Black + Decker trimmers]: Designed for use with Black & Decker automatic line feed trimmers, this spool and cover is a Black & Decker spool, a perfect replacement.2. [Feed System Replacement]: Eliminates the time spent with hand-wound trimmers, compatible with the Black + Decker trimmer and uses centrifugal force to feed the cutting line as needed.3 . [Upgraded Material]: Upgraded 0.065 inch diameter nylon line, supports fast cutting and longer service life. (Note: Only suitable for tender weeds. Hard and strong weeds, please use blades to trim)4. [Package Included]: 6 replacement chain spool, 2 replacement spool cap, 2 springs