The PorcelainPlus Speedbit was specifically designed for drilling through hard surfaces such as porcelain tile, marble, granite and quartz along with ceramic tile, glass and mirrors.
Using a hand held cordless drill, simply dip the drill bit in a cup of cool water, place the drill bit on the specified mark, apply pressure, listen for a slight CRUNCH and start your drilling process.
Because the Speedbit is a scraping tool it will generate high heat. You will recognize this when the drill bit starts to release smoke.
When this starts happening, stop drilling and re-dip the drill bit into the water. This will cool the bit down and increase its longevity. Continue this sequence until the hole is completely drilled. For best results your top drilling speed should be between 800 and 1200 RPM’s and slowed down to 500 RPM’s while breaking through the hole. This process will assure you of having clean holes and not broken tile.