Replaces OEM: Gb Et18-50mh, Oregon 180glgk041
Fits Models: Echo Cs400, 440, 510, 520, 3600, 3700, 3900, 4000, 4010, 4100, 4200, 4400, 4500, 4510, 4600, 4601, 5000, 5100; Red Max G415avs
Specifications: Type: Replaceable Sprocket Nose , Pitch: .325 , Length: 18 ", Gauge: .050 , Drive Links: 72