The RUBI EASYGRES diamond drill bit set is designed for wet drilling holes in various types of tiles, marble, and granite. Suitable for use with a drill. Special featuresFor wet drilling in ceramic tiles, marble, and granite EASYGRES set for diameters 6-12 mm: diamond drill bits, guide, centering ring, and tape EASYGRES PLUS set: 7 diamond drill bits (20, 28, 35, 43, 50, 68, 75 mm), MULTIDRILL guide, water tank with hose, and case EASYGRES 35 mm set: 35 mm diamond drill bit, MULTIDRILL guide, water tank with hose Drilling depth: 25 mm Side opening for improved cooling and easy removal of drilling debris Recommended speed: 400-1000 rpm depending on material Average lifespan: 6-12 mm ? 10 holes; 20-120 mm ? 25 holes Technical dataMaximum RPM: 500 Maximum drilling length: 27 mm Included as standardEASYGRES diamond drill bit set with guide and accessories according to selected set (standard, PLUS, or 35 mm)