[For Flymo strimmer wire Replacement ] 36ft/11m flexible spool line, ideal replacement for model no FLY021 and 51393719. At 1.5mm in diameter, this strimmer line can cut and chop quickly. [Durable Double Autofeed Spool and Line] The strimmer wire is made of durable ABS spool and premium nylon line, which keep the spool line stable while using the grass trimmer, hard-wearing and cutting grass faster. [Easy to Replace for Flymo Trimmer Line] Do no additional tools are required, just remove the old spool line and replace it with a new one to complete the installation, keep your grass trimmer performing. Once you replace the old spool with this one your Flymo strimmer worked like new again. [Professional Accessories for Flymo strimmer line] This strimmer spool fits for Flymo strimmer spool FLY021, replacement of 513937190, ease the tedious work of hand-winding spools. [Nice Replacement for Your Run Out Spool] Let your old strimmer has a new lease of life. Easy to install and a far better construction than the earlier cords.