Triangle Drill Bit Set - It comes with 10 drill bits and two small boxes that are easy to carry and organize. Contains different sizes (4x6mm, 2x8mm, 2x10mm, 2x12mm), enough to meet your different needs. Durable and sturdy - our tungsten drill bit is made of high quality carbide. good abrasion resistance and extreme hardness. The carbide tip is durable and easily penetrates all different materials. Wide Application - These porcelain drill bits are highly precise for center drilling and are perfect for drilling holes in glass, tiles, mirrors, wood, ceramics and marble, Brick walls and other hard and brittle materials. Special Design - The triangular drill bits with U-shaped body design quickly remove dust when drilling without leaving burrs. The drill with 3-surface shank allows for easy grip and a firm hold. Easy to use - Can be installed in most standard electric hand drills and bench drills. All drills are stored in the storage box for quick changing. Product description Features: