Product description:

1. High-speed steel, high quality with good durability for you to use

2. Professional drill for deburring, chamfering, elliptic hole enlargement

3. Suitable for punch holes through sheet metal, steel plate, aluminum plate, brass or wood

4. This drill bit set includes 3 types (Spiral Hexagon,SpiralRound, StraightRound)

, and 3 sizes(4-12mm, 4-20mm, 4-32mm), which meet your different needs perfectly.

Specifications:

Finish: Titanium

Type: Step Drill

Surface Treatment: Titanium coated

Color: Silver, Gold

Length:

5 Step Bit: 4-12mm Length: Approx. 6.7cm/ 2.64"

9 Step Bit: 4-12mm, 4-20mm Length: Approx. 7.4cm/ 2.91"

15 Step Bit: 4-32mm Length: Approx. 10.2cm/ 4.02"

The 3 Bits Sizes:

15 Step Bit: 4-32mm (4，6，8，10，12，14，16，18，20，22，24，26，28，30，32mm)

9 Step Bit: 4-20mm (4，6，8，10，12，14，16，18，20mm) ; 4-12mm(4,5,6,7,8,9,11,12mm)

5 Step Bit: 4-12mm (4，6，8，10，12mm)

Package include:

3x Pcs drill bit