Koken Tools is a fourth generation family owned and operated business in Japan. The focus of the company is manufacturing hig ... hest quality sockets and socket wrenches available. The entire manufacturing process from design, cold forging, heat treat and plating is in-house at Koken facility. They are designed and manufactured using the latest technologies such as 3D-CAD, Maching centres and computer controlled heat treatment systems in order to deliver the highest quality and most modern designed sockets and accessories. read more