Replace for #: 4228-120-0608 / C1Q-S169 /C1Q-169B <br> Fits for the following models:<br> FS45 FS46 FS46C FS55 FS55R FS55RC trimmer<br> FS38 FS45C FS45L FS55C FS55T FS310 trimmer<br> FC55 edger<br> KM55 KM55C KM55R KM55RC HL45 HL45Z HL45DZ<br> 4-month hassle-free return & money back! Lifetime warranty against manufacturer defect! <br>