[9 sizes]- These drill bits have 9 different sizes (3, 4, 5, 6, 8, 10, 12, 14, 16 mm), 3 flat shanks, very suitable for drilling tasks, with a very high drill hole accuracy. Rotating thread design makes drilling and chip removal smoother. [Premium Material]- Carbide drills are and have a longer service life than the steel drills you usually use. [Superior Performance]- The solid tungsten carbide spear tipped drill is and easy to position. Drilling is stable and fast, without breaking the border, and the holes are neat and smooth. [U Type Slot Design]- The U-shaped groove design has rapid drilling and dust removal, and the triangular handle design makes the operation more stable. [Widely Used]- The sturdy tungsten carbide cutter with pointed tip can easily penetrate materials, such as brick, concrete, glass, mirror, plastic masonry and wood. Features: Item name: 15 Pcs Tungsten Carbide Tip Drill Bits Suitable for: Brick, concretel, glass, mirror, plastic masonry and wood. Colour:Black