1.Premium Multi-Material Drilling: Features an advanced four-edged carbide tip designed for precise and efficient drilling in hard, brittle materials like tile, ceramic, concrete, brick, glass, and wood; your essential all-in-one bit set for versatile household and professional projects. 2.Unique Eccentric Sawtooth Flute Design: Engineered with a eccentric (sawtooth) flute that significantly improves chip removal and reduces friction and heat buildup, ensuring faster drilling speed, less resistance, and prolonged bit life. 3.Comprehensive 7-Piece Set: Includes a full range of popular sizes: 12mm, 10mm, 8mm, 6mm, 5mm, 4mm, and 3mm, providing the correct bit for any task, from small anchoring holes to larger plumbing and electrical installations. 4.Universal Hex Shank Compatibility: Equipped with a standard 1/4-inch (6.35mm) hex shank, making the bits compatible with most electric drills, cordless drills, and impact drivers, offering excellent stability and preventing slippage during high-torque applications. 5.Enhanced Durability and Longevity: Constructed from high-quality alloy steel with a distinctive yellow-brown heat, which boosts hardness, wear resistance, and high-temperature tolerance for a solid, long-lasting performance.