CALIBRATING TOOLS Basic tools in the polishing granite process, the cylindrical wheels and the roughing rollers are characterized by their high removal capability. Used in the roughing mode to calibrate the stone slabs or in the first positions for pre-polishing, these tools leave the surface of the slab with optimal smoothness and allow to increase the speed of work. Better performance of the tools used in subsequent positions is an important additional advantage of these tools. A continuous and abundant flow of water is recommended.