Masonry bits cut holes through concrete in two steps. The drill bit tip is larger in diameter than the shaft below, so when the shaft reaches the hole, it fits perfectly. They're commonly used in hammer drills to grind down masonry as they cut through it. Masonry drill bits are ideal for drilling holes in hard materials such as blocks, stones, bricks, or concrete. Masonry drill bits are suitable for concrete because they are made of tungsten carbide, which is designed to drill into tough, hard materials such as concrete, block, or stone. A masonry drill's cutting head is made of hardened metal.