Special moly alloy steel. Gold surface treated for maximum lubricity. Dual flute construction drills clean accurate holes in thin materials, quickly and easily. Use for all thin metals, rigid plastics such as plexiglas, and wood or composite materials with a thickness equal to or less than the step thickness.

Step Drill Sets 1/8-1/2, 3/16-1/2,& 1/4-3/4 3 Piece Set