Chain sprocket with fixed sprocket for chainsaw A : 13 mm B : 11,5 mm C : 66 mm D : 17,8 mm Pitch: 3/8LP Teeth: 6 Compatible with chainsaw models: 017 - 018 - 021 - 023 - 025 - MS170 - MS180 - MS210 - MS250 STIHL Part No. 360052