ISE Chainsaw Spur Sprocket for Stihl MS170 MS180 MS190 MS210, 7 Tooth, .325"
MS 210, MS230, MS250, 019, MS350C and MS190. Fits Models:STIHL 017, 018, 021, 023, 025, MS170, MS180. Non Genuine Pro Spur Sprocket. Replaces Part Number GB/ST305-J7N, Stihl 1123 640 2015.