The MILWAUKEE Carbide Natural Stone Drill Bit Set (4-Pack) is a high-quality set of power tools designed for drilling into various materials such as ceramic tile and glass. The drill bits are made of durable carbide material, ensuring long-lasting performance. With a lifetime manufacturer warranty and a 90-day return policy, you can trust in the reliability and quality of these tools. The set includes four pieces, each measuring 2 inches in length and 3/8 inches in diameter, making them suitable for use with air drills, drills, and rotary tools. The 3-flat shank style provides stability and efficient drilling, making this set a must-have for any DIY enthusiast or professional craftsman.