Black & Decker, grasshog, autofeed replacement spool, .065" line diameter, factory wound with 30' of line for maximum reliability, for use with gh400, gh500, gh600, gh610, gh900, gh912, st6600, st7000, st7700, cst1000, cst1200, cst2000, mtc220, mte912, nst2018, nst1118, nst2118, lst220, lst300, lst400, lst420, lst136.