Gently position the centering tip of the EXPERT Hex-9 HardCeramic on the tile. Start rotating the drill driver slowly. The special centering tip prevents the drill bit from slipping off the tile. Drill to a depth of approx. 1 mm, applying light pressure, then increase the pressure continuously. Increase the speed a little. Ideally, the drill bit should always produce a scratching sound. Then with a little patience, finish drilling the entire hole. If the drill bit starts to whistle, increase the pressure a little. If the whistling is persistent, change the drill bit. A whistling sound indicates that the drill bit is only rubbing against the tile, which creates heat and tension. Whenever possible, remove any drilling dust with a vacuum dust extractor to keep the workplace clean and extend the lifetime of the drill bit.