Ideal for drilling steel, copper, aluminum, brass, wood, oak, maple, MDF, pine, PVC, polycarbonate, acrylic, ABS, nylon, and composite materials, High speed stainless steel is designed to ensure sharp and fast execution in any material for clean results while making the bit long life durable and wear resistant, All purpose reduced shank has a 1/2-inch chiseled diameter to fit any type of drill chuck.