Fits these chainsaw models: Ryobi PCN4545, Husqvarna 136, 141, 137, 142, 340, 345, 350, 435, 440, 445, 450, Efco 138,141, 4100SP and more. Narrow kerf requires less power than other cutting systems, making more efficient cuts to finish the job quickly and easily - always use bars designed for narrow kerf saw chain.
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