HSS Step Drills HSS STEP DRILLSHSS Step Drills for drilling cylindrical holes in solid material up to a ... round holes in steel, brass, copper, aluminum, wood and plastic. Drills up to 13 holes sizes with one bit. Ideal tool ... x 1mm1113mm50 – 60mm x 1mm1113mm5 – 30.5mm1312mm5 – 38mm1412mm HSS Step Drills