Fit For MS171, MS181, M 11 Chainsaws: This carburettor rebuild kit is compatible with models including MS171, MS181, and M 11 chainsaws, as well as replacement part number RB-150 and For GHS 4463; includes 2 sets for multiple repairs or backups Replacement Part Number RB-150: -engineered to match original specifications with exact fit for C1Q-S119, C1Q-S120, C1Q-S121, C1Q-S122, and C1Q-S123 variants reliable performance and seamless installation Long Lasting Performance: Constructed with resilient materials designed to withstand repeated use under demanding conditions providing extended service life for your chainsaw carburetor system Color Black Design: Compact 10g black carburettor rebuild kit that integrates smoothly into existing engine setups while maintaining durability and resistance to wear over Package Contents 2 Sets: Comes in a package with 2 full sets of carburettor rebuild components allowing for convenient maintenance or sharing across multiple tools