This 20-Inch guide bar and chain combination features a 3/8" chain ideal for occasional commercial users and professionals. The chain has Chamfer Chisel cutters which offer outstanding performance and are durable, easy to maintain and forgiving. The AdvanceCut guide bar is reliable, lightweight and easy to maneuver. Both the bar and chainsaw chain are designed to be low vibration for added comfort and low kickback for added safety. This combo fits many chainsaw models including, but not limited to, the following: Echo CS-500EVL, CS-510-EVL, CS-590, CS-620P and CS-680; McCulloch 10-10A, Pro Mac 610 and Timber Bear; Poulan 3400, 3700, 400 and 5200.