Made of high-quality steel, high-hardness carbide blades and wear resistance,making drilling easier,can be used for a long time and than ordinary steel drill bits. Note: Add water when opening holes to increase servicelife. Package includes 10 Pcs drill bit set: 1/8Inch, 5/32Inch, 3/16Inch, 1/4Inch, 1/4Inch, 1/4Inch, 1/4Inch, 5/16Inch, 3/8Inch, 1/2Inch, there are 7 differenct cement drill bit sizes, that will help in drilling by starting with the smallest bit and continuing to the size needed. The eccentric bit set is suitable for tile/glass/hard plastic/cement//concrete and other materials, and the effect is more significant when used in conjunction with a water drill. Pointed design, this cemented carbide drill is , easy to locate, stable drilling, fast, not broken, neat and smooth. The three-flat handleThese masonry drill bits are perfectly suitable for various drilling tasks with high drilling accuracy. Rotating thread design makes drilling and chip removal smoother accuracy,ensures that you can hold it firmly without slipping and scratching, and will not damage the glaze of the tile. The openings are neat, smooth, without broken edges, no tremor, and easy positioning for novices. The cutting resistance is small, and the opening speed is improved. After slotting, it is easy to decorate and chip removal is easy. Colour:As Shown Material:Metal Package Contents: 1set * glass drill bit 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.