All the components of the machine are chosen from the best materials on the market; for example the steel bench of the machine is perfectly stable and has a low friction coefficient. The rotating heads holder bridge is made of 20 mm. steel which is fully treated and milled. Ali the parts of the machine which are in contact with water are of chromium or zinc plated stainless steel. The electric material corresponds to the E.E.C.-norms. The belt is guided on its lower side by a “V” belt to avoid the risk of lateral shifting. Ali vertical and horizontal movements are electrically controlled. The control panel is arm mounted to ease operation. The factory can supply customized machine with left to right direction of the slabs or a right to left version; with entry and exit rollers; with an automatic greasing unit or operating units for special needs.