7pcs Concrete Drill Bits, Black Bits with 4 Hard Cutting Edges, Multifunctional Hole Drilling Tool for Stone Tile Brick Wall Glass Wood Masonry Ceramic Granite (3/4/5/6/8/10/12 mm)

• 【Size】Cutting diameter: 3-12 mm, a set of 7 different specification drill bits, suitable for a variety of drilling needs • 【Material】This type of drill bit is made of alloy, with high hardness, high wear resistance, difficult to break and has a long service life • 【Function】Used for drilling holes in ceramic tiles/brick walls/concrete/glass/ceramics/wood/aluminum alloy/steel/plastic and other materials • 【Efficient】Compared to traditional double-blade drill bits, the four-blade drill bit is sharper; This drill bit uses a spiral cylinder, which effectively prevents chip buildup and significantly improves drilling efficiency. • 【Practical】The drill bit features a universal hexagonal shank design, making it widely used, sturdy, and durable. It's a high-quality accessory for hand drills, cordless drills, bench drills, and other drilling equipment.