3PC Cobalt Coating Step Drill Bit Set
Type: Step Drill Bit Set
Size: 4-12mm, 4-20mm, 6-30mm
Material: HSS
Finish: cobalt coating
Flute: spiral flute
Shank: Round
Packing: plastic box
Application: For drilling large holes in thin material and reboring existing holes, steel sheet and stainless steel from 0.1 to 2mm thick