Tonkachi Susa is a company founded in the heart of Japan's toolsmithing industry, Sanjo, Niigata. They specialize in manufacturing demolition tools such as hammers, mallets, axes, crowbars, pry bars and more, with an emphasis on safety and durability.

They partner with demolition experts in order to make tools right for the job, for example, they partnered with asbestos specialists to create useful tools for asbestos removal. They use high-quality materials for all of their products, often favoring white oak for handles, and chrome-plated tool steel for heads.

There are six brands under the Tonkachi Susa umbrella, with the most recognizable being Osho and Magnum Hammer.