The alm manufacturing hl007 spool head assembly kit is compatible with a range of dual line models homelite fits most homelite trimmers using 20 mm 080 inch line performance power bq trimmer models pro24cc bca pro24cc sgta pwr21cc sgta pwr25cc sbca ryobi rpt7011 jcb pbc25f plt25f stiga fits most petrol trimmers with curved shaft right hand thread champion trimmer models m22 the kit contains 1x housing 1x spool line 1x spool retainerbump knob1x spring it is supplied with 516unc x 12 inch right