3pcs Hss Step Drill Bit Set Titanium Coated Cone Taper Hex Drill Bits Hole Cutter Metric Spiral Center Step Drills 4-12/20/32mm

Specification:Deburring, Chamfering, Cutting or expanding holesSupporting tools: Pistol drill, Hand drill, Charging drill, Bench drill. Length:3-12mm Length: Approx. 7.8cm4-12mm Length: Approx. 6.5cm4-32mm Length: Approx. 10.0cmHexagonal handle diameter: 6.35mm Sizes:3-12mm:(3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm) 10 Steps4-12mm:(4mm, 6mm, 8mm, 10mm, 12mm) 5 Steps4-32mm:(4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 24mm, 26mm, 28mm, 30mm, 32mm) 15 Steps