Fits the Following Chainsaws
Stihl 017, 018, 019 T, 021, 023*, 025*, MS170, MS171, MS180, MS181, MS190 T, MS191 T, MS210, MS211, MS230*, MS250* (Chainsaws with Asterisk Usually Use .325 Pitch Chain)
Replaces Stihl Part Number 1123-007-1003, 1123-007-1031
Fits Crankshaft Diameter .3937 (10mm)
Drive Sprocket Bearing ORF 37325 (10 x 13 x 10)
Rim Spline Size Small 7 Tooth (RSS)