Neiko Tools 5 PC Metric HSS Step Drill Set with Case
Specification: 6mm shank - 4 to 12mm (9 steps with 1mm increment), 4 to 12mm (5 steps with 2mm increment). 8mm shank - 6 to 18mm (7steps with 2mm increment), 4 to 22mm (10 steps with 2mm increment). 10mm shank - 6 - 35mm (13 steps, 6, 8, 10, 13, 16, 18, 20, 22, 25, 28, 30, 32, 35mm)