Our diamond drill bits set includes 2pcs 1/4 inch, 1pc 5/16 inch, 1pc 3/8 inch, 1pc 1/2 inch diamond drills, and 2pcs 4-edge drills, meet your different drilling needs Our tile drill bits use advanced brazed diamond technology and high-quality materials to provide enhanced durability and efficient drilling Our drill bits for ceramic is filled with solid cooling wax, can effectively reduce drilling temperature without adding water. After the cooling wax is used up, it can continue to be used with water Our versatile tools tile drill bits suitable for ceramic, glass, porcelain, marble, , stone and bricks, compatible with most power drills, hand drills and bench drills, Angle grinder needs to be equipped with a converter Our drill is only used for initial drilling positioning, then adjust the dry diamond drill bit to a 45 degree bevel and tilt it on the tile. After cutting the crescent shaped groove at high speed(Greaterthan 2000 rpm), slowly vertically the drill to make holes, increase drilling speed,and wobble it to extract debris Colour:As Shown Material:Metal Package Contents: 1 set * tile drill bits Only the above package content, other products are not included. Note: Light reflection 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.