[Application] Holding tools for round bar marking and drilling. Holding tools for electric discharge machining and wire cutting. Holding tools for three-dimensional measuring instruments and various measuring systems. [Features] *The module design for light weight and easy handling. *Workpieces can be held on the top face (V face), front face and rear face. *The magnetic force can be turned ON and OFF using a special Thandle (or hexagonal wrench key) on the front and the rear (two places). The handle mounting area is flat. *They are of waterproof and oilproof construction. *One set consists of two blocks.