This Cobalt Steel Twist Drill Set includes precision drills from 0.50 mm to 2.2 mm, each mounted on 3/32" shanks for fast, convenient tool changes. Cobalt steel offers improved tool life over high speed steel, especially when drilling harder materials such as nickel-based white golds and stainless steels. Expect consistent cutting performance and extended service life across both hard and soft precious metals.
Features
- Cobalt steel construction for longer tool life than HSS
- Performs especially well in nickel-based white golds and stainless steels
- Extended service life when drilling yellow gold, silver, brass, and copper
- All drills mounted on 3/32 in (2.35 mm) shanks
- Ideal for fixed collet and quick change handpieces
- Standard 3/32 in shank size widely used in the jewelry industry
Specifications
| Material |
Cobalt Steel |
| Shank Diameter |
3/32 in (2.35 mm) |
| Size Range |
0.50–2.2 mm |
| Set Quantity |
9 Pieces |
| Application |
Drilling Precious and Hard Metals |
What’s Included
| Part # |
Size |
| 128.705 |
0.50 mm |
| 128.707 |
0.70 mm |
| 128.709 |
0.90 mm |
| 128.711 |
1.1 mm |
| 128.714 |
1.4 mm |
| 128.716 |
1.6 mm |
| 128.718 |
1.8 mm |
| 128.720 |
2.0 mm |
| 128.722 |
2.2 mm |
Notes
- Use appropriate speeds and lubrication when drilling harder alloys to maximize tool life.
- Designed for use with 3/32 in collet or quick change handpieces.
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