Feature:Fit for Chainsaw model MS170 MS180 MS230 MS250 MS260 MS290 MS360 MS390 MS380 MS381 MS440 MS460 MS640 MS650 MS660 009 010 012 015 020T 021 023 025 024 026 028 038 031 032 034 036 041 042 044 046 048 050 051 056 064 0666 high quality aftermarket replacement guide bar nuts that work great on Stihl, these nuts replace OEM number 0000-955-0801 and are used on the following models:009, 010, 011, 012, 017, 018, 019T, 020T, 021, 023, 024, 025, 026, 028, 029, 030, 031, 032, 034, 036, 038, 039, 041, 042, 044, 046, 048, 064, 066 MS170, MS180, MS181, MS190T, MS191T, MS192T, MS200T, MS210, MS230, MS240, MS240, MS241, MS250, MS260, MS261, MS290, MS271, MS310, MS340, MS360, MS361, MS362, MS380, MS390, MS440, MS441, MS460, MS461, MS660, MS661 plus others.19mm - 8 x 1.25 thread.Does not fit on saws with Collar Lock boltsDisclaimer :Reliable Aftermarket Parts is in not affiliated in any way with OEM manufacturers. All OEM part numbers and logos are to be used for identification purposes only. Specification:Color: SilverMaterial: Stianless SteelSize: As the pictureQuantity: 6pcs Package includes:6 x replacement guide bar nuts