***Make sure your saw uses a .325/.050 chain with 72 drive links...not all saws listed use this chain***Echo 18" Oregon Chain Saw Repl. Chain Model #CS-400EVL, CS-440, CS-440EVL, CS-510, CS-520, CS-3600, CS-3900, CS-4000, CS-4100, CS-4400, CS-4500, CS-4600, CS-5000 (2072) .325 " Pitch .050 Gauge 72 Drive Links, Professional Chain -Manufactured by Oregon Not sure if this is the right chain for your saw?....MESSAGE US! We will be glad to help! Professional Chain -