Rim Sprocket used on Echo CS450, CS451, CS452, CS500 & CS550. To use when replacing 3/8 chain with .325.

Replaces:
Echo A556000441 (replaces A556000440), 17511412530 (Rim)

Fits Models
ECHO: CS450, CS451, CS451P, CS452, CS500, CS550, CS5500P