Material:Alloy SteelFastener Type:WellExterior Finish:Stainless SteelMetal Type:Alloy SteelSize:5 NutsPackage Dimensions:3.86 x 2.64 x 0.35 inchesItem Weight:2.08 ouncesQuality Sprocket Cover Bar Nut, replacement for STIHL Chainsaw; replacement manufacturer part number: STHIL 0000 955 0804. (Inside Diameter (D): 1/4 inch; Outside Diameter (d): 3/4 inch).Package includes 5 pieces replacement Bar Nut, compatible with Stihl MS170 MS170C MS171 MS180 MS181 MS192T MS200 MS200T MS210 MS211 MS230 MS231 MS240 MS250 MS251 MS260 MS270 MS280 MS290 MS291 Chainsaw.Replacement Bar Nut compatible with STHIL MS310 MS311 MS340 MS360 MS360C MS361 MS362 MS390 MS391 MS440 MS441 MS460 MS461 MS640 MS650 MS660 ChainsawAll our quality replacement spare parts have been thoroughly tested to meet OEM standards performance.Regular engine maintenance will help your engine run better and last longer. Using quality parts on your equipment will make sure it fits well and runs the way its supposed to.LETAYAR specializes on high quality outdoor and garden machinery accessories.