【Vacuum Brazed】More Heavy Duty and Wear Resistant than electroplated diamond bit, provide very high efficiency,cuts faster,durable and sturdy
【Multi-function】 This tile countersink diamond drill bits is designed to enlarge holes or trim the edge of tile granite marble or other stone
【General Purpose】Beveling Chamfer for granite & marble, masonry, concrete, tile/ceramic, glass, hard plastic, compatible with most angle grinder/driller
【Recommendation】Wet/Dry drilling both OK, Use water for longer work life and higher efficiency.