6mm Diamond Hole Saw: Dry Diamond Core Drill Bits Kit for drilling holes diameter of 6mm. Vacuum Brazed Diamond Technology: Great for drilling clean holes to hard materials especially tiles, porcelain ground, ceramic glass mirror marble stone masonry brick (not for wood). Dry Drilling Design: Diamond Drill Bit integrated with wax lubricant inside which melts while dry drilling and cools the cutting ; Water can be used as additional cooling to prolong the life of the bit. Unique Details: Diamond coating enhances the drilling speed; Round Shank compatible with most machines such as Hand Drill, Angle Grinder, Bench Drill; Side help to remove debris and drill holes smooth and fast; Depth mark useful for precise project. This Diamond Drill Bits set comes with a portable storage case for convenient use and store. Colour: black Material: diamond Package Contents: 5 x Dry Diamond Drill Bits Only the above package content, other products are not included. Note: Light 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.