[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[Dry Drilling Design]Diamond Drill Bit made of Diamond and integrated with wax lubricant inside, which can melt while dry drilling and cool the cutting surface; Water can be used as additional cooling to prolong the life of the bit[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[Easy to Carry and Use] This Diamond Drill Bits set comes with a portable storage case for convenient use and store.Colour:blueMaterial:DiamondPackage Contents:1 * Bits diameter of 1/4 inch(6mm)1 * Bit diameter of 5/16inch (8mm)1 * Bit diameter of 3/8inch (10mm)1 * Bit diameter of 1/2inch (12mm)1 * Bit diameter of 9/16inch (14mm)1 * Bit diameter of 5/8inch (16mm)Only the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.