Step Cone Drill Bit 3-12mm, 10 Steps
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Prices updated: 12 Oct 2026
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About this product
A 10-step cone drill bit covering hole diameters from 3 to 12 mm, with two flutes for faster and smoother cutting. It is intended for drilling and enlarging holes in steel, brass, wood and plastic. Useful for hobby projects, enclosure panels and cases where several hole sizes are needed from one tool.
Specifications
- Diameter range
- 3-12 mm
- Steps
- 10
- Flutes
- 2
- Shank
- Hex (title) / 3-sided (description)
- Suitable materials
- Steel, brass, wood, plastic
Frequently asked questions
Which shank type fits my drill chuck?
The listing mentions both a hex shank in the title and a 3-sided shank in the description. Check the shank shape against your drill chuck, since the chuck must grip the flats firmly to prevent slipping.
How should I use it on metal?
Drill a small pilot hole first, use cutting oil on steel, keep the speed low and advance gradually through each step. This reduces heat buildup and keeps the step edges from chipping.
