Description: Sprocket Bearing Replaces OEM:(Please be sure of your OEM part number before purchase) For Stihl: 9512 933 2260, Fits Models: For Stihl 017, 018, 019 T, 021, 023, 024, 025, 026, 029, 034, 039, MS 170, MS 171, MS 180, MS 181, MS 190 T, MS 191 T, MS 210, MS 211, MS 230, MS 231, MS 240, MS 241, MS 250, MS 251, MS 260, MS 261, MS 270, MS 271, MS 280, MS 290, MS 291, MS 310, MS 311, MS 390 and MS 391 chainsaws