Sprocket with fixed sprocket for ECHO chainsaws Pitch: 3/8 Teeth: 7 compatible with chainsaw models: CS650 - CS660 - CS500 - CS610 - 550 CS510 - CS550 - CS451VL - 452 - 500 - CS610 - 660 - 650 sizes: a: 14 mm b: 12.8 mm c: 77.5 mm d: 13.8 mm Article No. 360026