【PACKAGE INCLUDES】7 Pieces of Dry Diamond Core Drill Bits Kit, for drilling holes diameter of 1/4 inch(6mm) - 2PCS, 5/16inch (8mm), 3/8inch (10mm), 1/2inch (12mm), 9/16inch (14mm) and 5/8inch (16mm); Sufficient quantity and multiple diameter specifications can meet your different needs 【APPLY TO】Great for drilling clean holes to hard materials especially tiles, porcelain ground, granite ceramic glass mirror marble stone masonry brick, Note: not for wood 【DISSIPATE HEAT】Diamond Drill Bit made of carbide and integrated with wax lubricant inside, which absorb and dissipate heat for a faster and cooler drilling performance. 【DRY DRILLING DESIGN & DURABLE TO USE】 Round shank diamond drill set, which can melt while dry drilling and cool the cutting surface; Which means there is no requirement for additional lubricant. 【WIDE COMPATIBILITY】Diamond coating enhances the drilling speed; Round Shank compatible with most machines such as Hand Drill, Angle Grinder, Bench Drill; Depth mark is also useful for precise project. Attention:if use Angle Grinder,please install angle grinder drill chuck