BGTEC Dry Diamond Core Drill Bit, 5Pcs 6mm Vacuum Brazed Hole Saw with Triangle Shank for Porcelain Tile Ceramic Granite Marble Masonry

5 Pieces of Dry Diamond Core Drill Bits Kit for drilling holes,diameter of 1/4 inch(6mm), diamond length 10mm, Triangle Shank Multi-purpose drilling for porcelain tile/ceramic, granite, marble, masonry Dry Drilling Design: Vacuum Brazed Diamond Drill Bit integrated with wax lubricant inside which melts while dry drilling and cools the cutting surface; Water can be used as additional cooling to prolong the life of the bit Triangle shank compatible with most machines such as electric drill,hand drill,Bench Drill, preventing bits from slipping, improving your working efficiency. If you encounter any problems or are not satisfied with the products while using our Diamond Drill Bits, please feel free to contact us.