During precision machining, such as grinding, honing or polishing, rotationally symmetrical components must be supported, held or guided to absorb process forces and prevent a deflection due to the component’s own weight. In ultra precision machining, this can only take place by means of fixed guiding elements such as prisms, sliding blocks, tips, hollow tips or steady rest blocks. During machining, the guiding elements rub and slide on the work piece surface and thus influence the quality of the components. Low friction values and high wear resistance are called for: an ideal task for diamond!