High-quality: carbide-tipped alloy head material with stronger hardness. Carbide drill bits are built to last and stay sharp much than conventional steel drill bits.[U Type Slotted Design]U type slot design with fast drilling dust removal, triangular handle design, stable operation.Wide range of applications: the pointed design of the strong tungsten carbide tip can penetrate different materials (porcelain ceramic tiles, glass, , plastic masonry and wood). If you use the drill to drill concrete, brick wall and other hard materials (glass, porcelain floor tiles, or granite), use water for lubrication.7 different sizes: 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm. 3 flat , these drill bits for glass perfectly match different drilling tasks, high drilling accuracy. Rotating thread design, drilling and chip removal smoothly.[Premium Performance]Spear pointed design, this strong tungsten carbide drill is sharp, easy to locate, drill stable, fast speed, does not the limit, opens , . The 3-flat shaft ensures that you can hold it firmly without slipping and scratching, will not damage the tile glaze.colour: black + silverMaterial: carbidePackage Contents:7 x drill bits(3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm)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.