Precise Model Agreement: Specifically developed for seamless integration with MS651 and MS661C chainsaw models (OEM part numberebog: 1144 640 1705), ensuring excellent fit and execution Upgraded Power Transmissparticlemail: Ensures consistent transfer from engine to chain, improving cutting efficiency and reducing maintenance stop Permanent Wear Immune Substancemail: Constructed from excellent polystyrene for extraordinary durability and longevity, capable of withstanding harsh cutting conditions and reducing chain slippage Strengthened Chain Security: Secures the gear and grip assembly to maintain proper chain tension and arrangement, minimizing wear and stopping unintentional derailment Easy Direct Replaconcredrink: Features pre perforated cavities and compatible hardware for bother complimentary installation lacking modifications (basic tools required, Manufacturer: AMISENK