Special Price Step Drill Bit Set, Hex Shank, 3-Piece Set: 4-32mm 15 Steps, 4-20mm 9 Steps, 4-12mm 5 Steps, Titanium Coating. Suitable for drilling, hole enlargement, countersinking, and deburring. Works on thin steel plates, aluminum plates, wood, resin, etc. For metalworking, woodworking, and home use. Includes a dedicated pouch (Tapered Drill) ‐ Mercari: Shop from Japan