Rotary 9383. HEAD ASSEMBLY COMPLETE WITH 10mm x 1.25 FLH & 8mm x 1.25 MLH ARBOR BOLTS. FITS ECHO, SHINDAIWA, STIHL, GREEN MACHINE, MARUYAMA & RED MAX. ROTARY'S NEW COMMERCIAL DUTY TRIMMER HEAD FEATURES: BUMP-FEED LINE ADVANCING. DUAL LINE. DURABLE NYLON CONSTRUC