The ALM Manufacturing HL007 Spool Head Assembly Kit is compatible with a range of dual line models: Homelite: fits most Homelite trimmers using 2.0 mm (.080 inch) line. Performance Power/ B&Q Trimmer Models: PRO24ccBCA, PRO24ccSGTA, PWR21ccSGTA, PWR25ccSBCA. 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 retainer/bump knob.1x spring. It is supplied with 5/16unc x 1/2 inch right hand thread bolt. The spool head assembly kit compares to 1911-9009-01 / DA3001-A.