Designed for industrial applications, each step produces accurate, parallel holes with a small clearance on the nominal diameter.The maximum material thickness is determined by the length of step (If the work piece can be reversed multiply thickness by 2).For use in industrial power tools or pedestal drilling machines.The most comprehensive range of Drills for all applications.When drilling metals always use cutting compound - available in 30cc, 60cc and 1/2 kilo sizes.