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