Step Construction Bits are designed to cut soft to medium-soft formations. It features a carbide step type design and a carbide-tipped spiral pilot neck. The swept back tapered design keeps the bit centered in the hole. This type of bit should be used in dirt, clay, sand rock, and light sandstone formations. The HDD is known for its fast penetration due to its stair step blades, which produce small cuttings that are easily removed from the hole.