Grass Hog, 3 Pack, 30' x .065", Replacement Trimmer Line & Spool, Factory Wound For Smooth Reliable Operation, Fits Multiple String Trimmer Models: GH400, GH500, GH600, GH610, GH900, GH912, ST6600, ST7000, ST7700, CST1000, CST1200, CST2000, MTC220, MTE912, NST2018, NST1118, NST2118, LST220, LST300, LST400, LST420, LST136.