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 Construction. Large Capacity Spool. Easy Spool Release. Fits Multi Applications. Uses our 30113 LH Knob.<br><br>