HIPA (Pack of 6) Sprocket Cover Bar Nut for STIHL MS171 MS181 MS192T MS211 MS231 MS251 MS291 MS311 MS361 MS362 MS391 MS441 MS461 Chainsaw Chain sprocket cover bar nut Fits STIHL MS171 MS181 MS192T MS211 MS231 MS251 MS291 MS311 MS361 MS362 MS391 MS441 MS461 Chainsaw Qty: 6pcs