Features For use with the ECHO chain saw models CS-301/310/341/346/352/330T/360T and CS-370 For use with ECHO bars 16A0CD3757 and 16A0ED3757 Chain is both rust-resistant and weather resistant Specifications Length: 16" Gauge: 0.05 Manufacturer Number: 91PX57CQ Number of Drive Links: 57 Chain Pitch: 3/8"