Suitable Models: Compatible with multiple string trimmer models: GH400, GH500, GH600, GH900, GH912, ST6600, ST7000, ST7700, CST1000, CST1200, CST2000, MTC220, MTE912, NST2018, NST1118, NST2118. LST220. LST300. LST400. LST420, LST136. Quality Materials: Our spool replacement is made of durable ABS material and polyamide nylon thread, strong toughness, not easy to break, flexible spool, long service life, aerodynamic shape allows less resistance to achieve more effective work. Easy To Use: Simple and intuitive use for quick and easy installation, Professional CNC machine cutting and automatic bobbin winding is safer and less time consuming than manual bobbin winding. Storong Resistant: The strong nylon wire structure ensures less breakage and longer life to effectively clear all weeds along walls and trees, 0.065 inches diameter wearable line supports fast cutting and easily cuts through grass and weeds. Widely used: strimmer line black and decker is specially designed for black ensures less breakage and longer life for Decker thread cutters, which can easily cut through the delicate grass and is suitable for gardeners, agriculture, landscaping and other fields.