Threaded shank drill bits can drill precise holes in confined spaces and hard-to-reach areas. The bits have threaded shanks that connect to drills and attachments, and they are often used in the aviation industry. These Threaded Shank Drill bits are manufactured to NAS 965 Type "D" specifications and are designed for drilling hard, high tensile strength materials.

Double margin drill bits have an additional margin ground behind the leading margin, providing twice the number of contact points. This second margin performs various functions to improve hole quality. The trailing margin burnishes the cavity, making a true hole and smoother finish, helping to provide a more concentric drilled hole.