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HSS Spiral Flute Step Drills
The CBN ground and spiral flutes guarantee quiet running and high cutting performance.
 
Especially the chip flow is optimized, so even long, non-breaking chips will be removed easily.
 
The optimized chip flow protects the cutting edges and reduces built-up edges and cold weld marks.
 
The cone makes it easier to withdraw the tool from the material.
 
High quality guarantees those single cutting edge creating perfect round holes in metal board, wood board, plastic, stainless steel with the thickness less than Step drill bit step height. 
 
Surface Treatment: Bright finished, Tin-coated, Nitriding-coated.
 
Tin coating will improve that cutting life effectively. 
 
Size Range
Step Nos.
Shank Size
4 每 12mm x 2mm
5
6mm
4 每 12 mm x 1mm
9
6mm
4 每 20mm x 2mm
9
8mm
4 每 22mm x 2mm
10
8/10mm
4 每 30mm x 2mm
14
10mm
4 每 32mm x 2mm
15
10mm
4 每 39mm x 2-3mm
14
10mm
5 每 28mm
7
10mm
5 每 28.3mm
10
10mm
5 每 35mm x 2-3mm
13
13mm
6 每 18mm x 2mm
7
10mm
6 每 20mm x 2mm
8
10mm
6 每 24mm x 2mm
10
10mm
6 每 25mm
7
10mm
6 每 26.75mm
8
10mm
6 每 30mm x 2mm
13
10mm
6 每 30.5mm
10
10mm
6 每 32mm
8
10mm
6 每 32mm
9
10mm
6 每 37mm
12
10mm
6 每 38mm
12
10mm
6 每 40mm
16
13mm
9 每 36mm x 3mm
10
12mm
10 每 20mm x 1mm
11
10mm
12 每 20mm x 1mm
9
10mm
12.5 每 30.5mm
7
12mm
13 每 38mm
10
12mm
14 每 24mm x 2mm
6
13mm
14 每 25mm
7
13mm
20 每 30mm x 1mm
11
13mm
20 每 34mm x 2mm
8
13mm
30 每 40mm x 1mm
11
13mm
40 每 50mm x 1mm
11
13mm
50 每 60mm x 1mm
11
13mm
5 每 30.5mm
13
12mm
5 每 38mm
14
12mm
 
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