Features: 1High Strength Material: Made of premium carbide rust and corrosion resistant strong carbide tip high hardness carbide insert wear resistant durable and corrosion resistant. 2Efficient Design: 4 blade design low cutting resistance precise and effortless drilling can easily penetrate a variety of materials at one time efficient and time saving. Additional anti slip triangular handle design stable operation. 3Applicable Surfaces: Carbide tip maximizes carbide surface contact for extended life. Provides smoother and more precise drilling on tiles marble sheet iron mirrors and glass. Remember to add water or coolant when drilling. 45 Drill Bit of Different Sizes: This drill bit set includes 5pcs different size of drill bit 3x70mm 4x70mm 5x76mm 6x77mm 7x80mm. 5Wide Compatibility: This drill bits set can fit most electric or cordless hammer drills regular electric drills electric drills hand drills and bench drills. Specification: Item Type: Drill Bit SetMaterial: CarbideGross Weight: 77g / 2.7ozProduct Size: 3x70mm / 0.12x2.76in4x70mm / 0.16x2.76in5x76mm / 0.20x2.99in6x77mm / 0.24x3.03in7x80mm / 0.28x3.15in Package List: 5 xDrill Bit