Rotary 9300. HEAD ASSEMBLY COMPLETE WITH 10mm x 1.00 FLH & 7mm x 1.00 MLH ARBOR BOLTS. FITS STIHL, RED MAX & SHINDAIWA. ROTARY'S NEW COMMERCIAL DUTY TRIMMER HEAD FEATURES: BUMP-FEED LINE ADVANCING. DUAL LINE. DURABLE NYLON CONSTRUCTION. LARGE CAPACITY SPOOL. E