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The hexagonal (hex) shank is a common feature in many drill bits. It's designed to fit into a compatible hex chuck, providing a secure grip and preventing slipping during drilling. The hexagonal shape allows for easy and quick bit changes. The "flat wood bit" has a flat, paddle-like blade with a pointed tip. This design is ideal for drilling large, flat-bottomed holes in wood. It's often used for tasks like creating holes for pipe or cable routing. These bits are made of high-speed steel, which provides durability and maintains sharpness during extended use. Flat wood bits have spurs and cutting edges that help initiate the hole and ensure clean, accurate drilling. The spurs create a guide hole for the cutting edges to follow. The flat blade design allows for faster drilling and efficient chip removal, making it suitable for both professional carpenters and DIY enthusiasts. While primarily used for wood, these bits can also drill holes in other soft materials like plastic and certain types of composite materials.