Photo: Tips for Buying and Using the Best Drill Bits for Concrete Hole saw bits have sizes that go up to 4 inches or more. The smallest masonry bits are around 3/16 inch in diameter, with larger bits topping out at the ½-inch size. Masonry drill bits come in a variety of sizes to suit a broad range of needs. Hex shank bits will fit into a standard cordless or corded drill chuck, while SDS+ bits will only fit rotary hammer drill chucks. Masonry bits also come in SDS+ and hex shank styles. A ½-inch size drill will fit drill bits with a shank up to ½-inch in diameter, while a ⅜-inch size drill will only fit drill bits with shanks up to ⅜ inch in diameter. When buying any type of drill bit, it’s crucial to consider its compatibility with the drill. Tungsten carbide coatings enhance the drill bit’s strength, enabling it to bore through stone and concrete. Black oxide coatings are more durable than high-speed steel, as they resist rust and corrosion. Some drill bits have coatings to improve their performance. Saw drill bits intended to cut through masonry have a diamond coating instead of a blade, which grinds cleanly through tile, brick, and other masonry. The blade attaches to a mandrel or arbor that, in turn, connects to the drill. A saw drill bit has a cup shape with a saw blade that runs around the rim of the bit. Saw Drill Bit: A hole saw bit is for drilling large holes through wood, metal, plastic, tile, and even glass.These bits feature a shank that will only fit a rotary hammer drill. A rotary percussion bit has a harder tip that can withstand the impact. Rotary Percussion: A rotary percussion drill bit works with a rotary hammer drill that penetrates the material by creating an impact motion with the drill bit and rotating it.Double flute bits come in shanks that fit standard drills or rotary hammer drills. The double flute design can drill through concrete and other masonry twice as fast as standard drill bits.
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