Check the listing for details. Trimmer Head For Echo SRM-225 SRM-230 Speed-Feed 400 High Quality String Trimmer. Color: Black, Condition: New. Listed at 36.98 USD. 📣Note:This is a combination link. You will get what you choose. Please Pay Attention When Installing： You don’t take it apart. You spin it until the arrow lines up with the hole. Then you just feed about ten feet of line on each side and spin it. It spools up as you spin. If you have leftover line inside the spool you will need to take the unit off to empty the line. You are supposed to be able to press-in the panels on the side enough to clear the retaining ledge to free the top of the unit to pull out the spool. Fits Adaptor Size: M10 X 1.25 Used on Trimmer Line:2.4mmX2.5m Note:Please check the installation size of your grass head before proceeding with your order, thank you! Echo PAS-225 (S59511001001-S59511003000) Gas Power Source Attachement PAS-225 (S59511003001-S59511999999) Gas.