This diamond drill bit is made in Italy with a high-quality diamond construction, ensuring it will quickly drill numerous holes (up to 25 or more). The bit can be used on the hardest porcelain, ceramics, natural stone (granite, marble, slate, and limestone), terracotta, and glass. The bit is designed to fit any 3/8" rotary drill (NOT a hammer drill) with a recommended drilling speed of at least 800 RPM. The average drilling time is 20 seconds per hole.
