Fit for Chainsaw models 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, 066 6 high quality aftermarket replacement guide bar nuts compatible with Stihl chainsaws. 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, MS241, MS250, MS260, MS261, MS290, MS271, MS310, MS340, MS360, MS361, MS362, MS380, MS390, MS440, MS441, MS460, MS461, MS660, MS661 and others. 19mm - 8 x 1.25 thread. Not compatible with saws equipped with Collar Lock bolts. Disclaimer: Reliable Aftermarket Parts is not affiliated with any OEM manufacturer. OEM part numbers and logos are used solely for identification purposes. Specifications: Color: Silver Material: Stainless Steel Size: As shown in image Quantity: 6 pieces Package includes: 6 x Replacement guide bar nuts