【Special Price】Drilling, Hole Enlargement, Chamfering, Titanium Coating, Deburring Work. 4-12mm 5-step, suitable for processing thin steel plates, aluminum plates, wood, resin, etc. 4-20mm 9-step for ironwork, 4-32mm 15-step for woodworking. Set of 3, for home use, Hex shank, with a dedicated pouch (Step Drill, etc.) ‐ Mercari: Shop from Japan