GMM has designed and put on the market a wide range of calibrating and polishing machines, fully automatic and made in different versions, each of which is specific for processing marble, granite, stones and composite materials or even cement agglomerates. Calibrating, polishing and single calibrating-polishing machines are produced in different and multiple models to work on pieces with widths ranging from 650 to 2100 mm and workable thicknesses from 100 to 400 mm; they can operate individually (on a single simple line) or be inserted in production lines even very complex and customized. In combination with advanced technological and electronic solutions (GMM machines are 4.0 ready) they guarantee ease of use, low running costs and long life.