Features: Suitable for a variety of BLACK+ DECKER wire cutters GH400, GH500, GH600, GH610, GH900, GH912, ST6600, ST7000, ST7200, ST7700, ST7701, ST8600, ST9000, CST1000, CST1200, CST2000, N MTC2020 NST1018 NST1118, NST1810, NST2018, NST2118, LST120, LST136, LST140, LST201, LST220, LST300, LST400, LST420, LST522, LST1018, LSTE523, LSTE525, BESTA510, BESTA512, BESTE620 Premium AF-100 Series 0.065"/1.65mm Wearable Includes Six Premium Trimmers for and Continuous Operation.【Labor-Saving】Through centrifugal force automatically to the cutting rope, so you are not so tired in the grass cutting process.【6 + 1 + 1 Accessories】The package includes 6 30-foot finishes; 1 pack tube replacement lid cover; 1 Pack of Springs【Automatic Feeding System】Designed for Black Decker Wire Cutter. Replacing the spool with an automatic feeding system can reduce the tedious work of manually winding the spool. Package Included: 6 Replacement Spools, 1 Spool Cover, 1 Spring