Halls MC 2M High Speed Steel Step Drill 10mm to 20mm
is no longer available although you may find similar or newer versions below:
A step drill provides an easy way to cut the hole size you want
Size range.10,11,12,13,14,15,16,17,18,19,20mm.Maximum Material Thickness.4mm.Shank to fit chuck size : 10mm.
When drilling metals always use a coolant.