Diamond drill bits designed for precise and clean cutting of stoneware, ceramics, porcelain and compositesoin dry or wet conditions They allow you to cut holesos, for example, for sinks, wall plugs (5 mm drill bits) or ventilation pipes for eaves (125 mm drill bits). • fast and precise cutting with no brittleness of the materialos being cut• steel body with high quality diamond electroplated edge• aohole in the side of the drill bit ensures effective cooling and removal of excavated material• designed for non-impact drilling• recommended rpm range: 600 rpm