HSS Titanium Step Drill Bit Set Hole Cut Reamer 4-12mm 4-20mm 4-32mm (3pc)

1 Cutting materials : thin iron plate , aluminum , insulation panels , PVC panels 4mm thickness within the timber . Able to play with a variety of drill hole . Material : HSS 4241      Specifications :4-32mm (4,6,8,10,12,14,16,18,20,22,24,26,28,30,32 mm) 7.1mm Shank       4-20mm (4,6,8,10,12,14,16,18,20 mm) 7.1mm Shank       4-12mm (4,5,6, 7,8, 9,10, 11,12 mm) 7.1mm Shank Ladder drill , also known as multi-purpose drill with straight flute , spiral groove , single slot