There are four protrusions, to the left and to the right, of the lower two part types. However these are not present in the upper three parts. Traditionally, we install four protrusions in post-processing using welding on the upper three parts. By integrating the four protrusions with forging, it was found that the strength improved remarkably while simultaneously reducing costs. We believe a strong forged product is born from a soft idea. It is the voice of the customer that provides the power to refine technology, so please consult us with all your needs and suggestions, big and small.