山下工業研究所 Company Profile

Specialized manufacturer of socket wrenches.

Yamashita Industrial Research Institute Co., Ltd. is a specialized manufacturer that only produces socket wrenches. In order to meet our customers' requests and needs, we prioritize "ease of use" and "workability" in our planning and manufacturing processes. We will continue to make further efforts and research to receive feedback such as "I'm glad I chose Ko-ken products; this product has helped me work more efficiently."