3pcs HSS High Speed Steel Cobalt Titanium Step Drill Bit 3-12mm 4-12mm 4-20mm

1 Step Drill Bits Set(3pcs). 9 Step Drill Bit: 4-20mm (4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm). 5 Step Drill Bit: 4-12mm (4mm, 6mm, 8mm, 10mm, 12mm). 10 Step Drill Bit: 3-12mm (3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm).

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