Yangoutool 3pcs HSS Spiral grooved Step Drill Bit 4mm to 12mm/20mm/32mm,Woodworking Metal Drilling Bit&Hole Cutter Bit

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Feature

1/4" Hex shaft drives are suitable for all kinds of power drills.And suitable for Woodworking Punching Tools
The bits come to a point and are thus self-starting. No need to use center punch.
They are more durable and not easily broken compared with the ordinary twist drill bits.
3Pcs spiral step drill bits, 4-12/4-20/4-32mm 29Sizes,main material high speed steel, titanium coated high quality step drill bits.
Automatically deburrs holes left by other bits, as the sharp increase to the next step size allows the cutting edge to scrape burrs off the entry surface of the workpiece. Save you time and effort.

Description

Feature:
Drill 19 hole sizes.
This compact set replaces 31 individual drill bits.
Titanium nitride coating for cooler running.
Quick-change 1/4" hex shank.
High Speed Steel for long service life.
They also help to enlarge existing holes.
Two-flute design gives you faster, smoother cutting
The drills are titanium coated for cooler running. With 3 pcs sets 9 stage + 9 stage + 15 stage step drills.Drill 19 hole sizes.
9 stage: 4-12mm(4, 5, 6, 7, 8, 9, 10, 11, 12mm)
9 stage: 4-20mm(4, 6, 8, 10, 12, 14, 16, 18, 20mm)
15 stage: 4-32mm(4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32mm)

USAGE SUGGESTION:
To avoid step drill bits become overheated and get burned up due to fast rotary friction,
we suggest customers to use cutting fluid to keep the bits cold during usage.