ECHO Chain Sprocket with cage FOR MODELS: CS400, CS440, CS3600, CS3900, CS4400, CS5100 DIMENSIONS: (A) BORE: 14 MM (B) OUTER DIAMETER: 73 MM (C) INNER DIAMETER: 70 MM INCH THROUGH: 325 " N TEETH: 7 CODE: 656224 ORIGINAL CODE: 513444 ECHO VR