The Black and Decker 0.065 in. Replacement Trimmer Line Spool for Black and Decker Grass Hog String Trimmers features 30 ft. of 0.065 in. replacement line. Compatible with Black and Decker GH400, GH500, GH600, GH610, GH900, GH912, ST6600, ST7000, ST7700, ST8600, CST1000, CST1200, CST2000, MTC220, MTE912, LST522, LSTE523, LSTE525, NST2018, NST1118, NST2118, LST140C, LST220, LST300, LST400, LST420, LST136, LST136W trimmers. Put your mind at ease when you use GEnuine BLACK and DECKER replacement parts.