637237 Oregon Speed-cut Nano Conversion Kit637237 Oregon Speed cut Nano Conversion Kit with 14" Bar This kit is used to convert an Echo CS 2511T CS2511P to a 0. 325 7T Clutch Speed cut nano system. Ensure this is the correct kit for your unit before purchasing, if you are not sure, reach out to us at 1 877 531 2873 Kit Includes: worm gear 325 7T Clutch sprocket Chain 80TXL059 (Speedcut Nano) 0. 325 Pitch 0. 043 Gauge 59 DL 14" Bar Must be used in combination with an Oregon SpeedCut Nano guide