89221-KW3-000 Hex (4mm) Wrench - Overview. The 89221-KW3-000 Hex (4mm) Wrench is a precision tool designed for use within Honda marine engine systems, crafted to support assembly, maintenance, and adjustment tasks. Its role is vital in ensuring reliable operation by providing the exact tooling needed to maintain Honda marine equipment with OEM accuracy and reliability. Engineered to meet strict factory specifications, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Specifically designed 4mm hex wrench for Honda marine applications.. Genuine OEM component ensuring perfect fit and reliable performance.. Manufactured to precise factory dimensions and tolerances.. Provides accurate torque and handling for maintenance tasks.. Integrates cleanly with existing hardware, seals, or housings.. Helps maintain expected durability, performance, and professional feel.. Why Choose Genuine OEM. Using original Honda parts like the 8922