Metalworking & Multipurpose Drill Bits / Gun Drill Bits6PCS Step Saw Drill Bits SetSpecification:4 - 12 mm 5 Steps (4mm,6mm,8mm,10mm,12mm)4 - 20 mm 9 Steps (4mm,6mm,8mm,10mm,12mm,14mm,16mm,18mm,20mm)4 - 32 mm 15 Steps (4mm,6mm,8mm,10mm,12mm,14mm,16mm,18mm,20mm,22mm,24mm,26mm,28mm,30mm,32mm)Saw drill: 3mm, 6mm, 8mm.6PCS Step Saw Drill Bits Set(With Box)