Reduced Shank Drills feature a shank smaller than the cut diameter for use in a variety of tools that have a chuck capacity smaller than the diameter of the hole to be drilled.

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.