Tube and pipe cutters, chalk lines. Zenten Bernhard Groten S.L. was founded in 1966 by Berhard Groten, a native of Solingen (Germany). They are a proud company loacted in Irun, Spain, which consists of 28 Specialists in the hand tool manufacturing. The create, develop and build tools for those who appreciate professional tools and are willing to know the origin of the tools they work with. High quality, Innovative design and Perfect finishing of the products they manufacture, reaching an export of 95% of turnover.