The DCT Square U-Shape Riser Block is for working with superstructures and heavy work pieces. Riser Blocks are firmly screwed by using connector bolts. When used as a table extension exceeding 1,000mm, the Riser Block has to be supported by a table leg. Combined with the legs, Riser Blocks can be flexibly used on the foundation rails. A multitude of clamping- and connection options, using different Riser Blocks and Stops, are facilitated by the five-sided bore holes and the optional diagonal hole arrangement. The 100x100mm grid simplifies orientation.