1. Heavy Duty: High quality tungsten carbide multi-purpose drill bit set prevents drill bit cracking and provides longer service life, sturdy and durable. 2. Multi-function Drill Bit Set: Strong pointed design tungsten carbide tip can easily penetrate various materials, U groove drill bit design, surface anti-rust treatment, drilling and chip removal more smoothly. 3. Assorted Size: With 7 different sizes: 3mm*1pcs, 4mm*1pcs, 5mm*1pcs, 6mm*2pcs, 8mm*2pcs, 10mm*2pcs, 12mm*1pcs, and come with 1 plastic case for convenient storage. 4. Practical Tool: The ceramic drill bits are perfect for drilling holes in bathroom tiles or bathroom mirrors. It is a useful tool for home, triangular handle, more stable operation, these glass drill bits fit perfectly drilling precision. 5. Multipurpose: The number of masonry drill bits is widely used, it can easily penetrate various materials, such as ceramic tile, glass, hard plastic, cement concrete, mirror travertine, brick wall, wood, and can reduce