This spline shaft kit is designed for the HANGKAI 2stroke 4HP water-cooled outboard engine. It is an essential component for the proper functioning of the engine, ensuring a smooth and efficient performance. The kit is manufactured in China and is compatible with all HANGKAI outboard engines. The brand HANGKAI is known for its high-quality marine engines, and this spline shaft kit is no exception. It is made with durable materials and designed to withstand the rigors of all types of marine environments. Whether you're out on the open water or navigating through narrow channels, this spline shaft kit will keep your engine running smoothly and reliably.