Part number: ALM CH057

ALM Manufacturing 57 drive link chainsaw chain

Suitable for the following Ryobi models with a 40cm (16") bar

ECW 1840,
RCS 3540C, 
RCS 4040C2

Compares to N1C-BL-M-57E SK

NOTE
Check the suffix of your model number carefully as some models with a different letter at the end were manufactured with a 56 link chain