ABC Cutting’s first job, over 40 years ago, involved creating a simple core hole in a wall. Before the invention of the barrel-style core bit, field workers, often apprentices, used a star bit and hammer to manually “jackhammer” a hole. Today, core drill bits range from ½ inch to 60 inches in diameter and are used for plumbing, ductwork, structural, and electrical installations. Materials such as concrete block, concrete, asphalt, brick, and steel can be core-drilled. Concrete core drilling creates circular openings for various applications and is typically performed using a wet process, though dry coring is an option for smaller holes when water cannot be used. Core rigs can be configured for special angles or extreme depths. The process removes only the perimeter of the hole, leaving the inner material, known as the core or slug. Concrete line drilling, though less common due to newer tools like wire saws and diamond chain saws, is effective for removing thick concrete or in tight spaces. This involves drilling overlapping holes around the perimeter of the area to be removed, leaving scalloped edges, which may be acceptable or can be finished by forming and pouring for a clean opening.