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.