AT Hole Enlarging Core Drills

Alfa Tools manufactures hole enlarging core drills (also called shell drills or core reamers), specialized 4-flute high-speed steel cutting tools designed to enlarge existing holes with precision and efficiency. Unlike standard twist drills that require a solid starting point, these core drills feature a hollow center that allows them to cut around an existing hole, removing only the material needed to reach the desired diameter. This design eliminates pilot drilling, reduces cutting forces, improves accuracy, and extends tool life. Ideal for machinists, fabricators, maintenance technicians, and manufacturing professionals who need to enlarge pre-drilled, punched, cored, or cast holes in steel, aluminum, cast iron, and other metals.