This is Husqvarna's OEM Part Number: 695000826. Dual line head for straight-shaft trimmers. For professional use.10mm Arbor, left-hand thread. Clamshell packaged. Fits Husqvarna Models: 122L, 125L, 125LD, 125R, 125RJ, 225L, 225LD, 225R, 225RJ, 232L, 232R, 235RJx, 240L, 322L, 323L, 325Lx, 326Lx, 322R, 323R, 325Rx, 326Rx, 326LS and 327LS.