Rotary 9339. HEAD ASSEMBLY COMPLETE WITH 12mm x 1.75 FLH ARBOR BOLT. FITS HUSQVARNA. ROTARY'S NEW COMMERCIAL DUTY TRIMMER HEAD FEATURES: •BUMP-FEED LINE ADVANCING. •DUAL LINE. •DURABLE NYLON CONSTRUCTION. •LARGE CAPACITY SPOOL. •EASY SPOOL RELEASE. •FITS MULT