18" Bar & Chain Xtender. It is compatible with Poulan, Echo, and Shindaiwa chain saws. This AdvanceCut guide bar and chain combination features a .325 chain, ideal for occasional commercial users. The low-vibration micro chisel cutters provide excellent performance, easy maintenance, and low kickback. The AdvanceCut guide bar has a small radius multi-rivet nose for enhanced durability and control. Backed by a limited lifetime warranty.