Echo 18" ISE&reg; Chain Saw Repl. Chain Model #Cs-450, Cs-450p, Cs-530, Cs-550p (oregon equivalent 2072) Fits Saws Listed That Use a .325 Pitch , .050 Gauge Chain with 72 Drive Links Highest quality replacement chain replaces Echo Chainsaw Chain- 18 Inch, 72 Drive Links, .325 Pitch, .050 Gauge