This Complete Set of 19 Cobalt Steel Twist Drills provides a full size range from 0.50 mm to 2.30 mm, each mounted on 3/32" shanks for fast, convenient tool changes. Cobalt steel delivers longer tool life than high speed steel, especially when drilling harder materials such as nickel-based white golds and stainless steels. The result is consistent cutting performance across both tough alloys and softer precious metals.
Features
- Cobalt steel construction for extended tool life over HSS
- Performs especially well in nickel-based white golds and stainless steels
- Long 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
- Complete size progression for precision drilling tasks
Specifications
| Material |
Cobalt Steel |
| Shank Diameter |
3/32 in (2.35 mm) |
| Size Range |
0.50–2.30 mm |
| Set Quantity |
19 Pieces |
| Application |
Drilling Precious and Hard Metals |
What’s Included
| Part # |
Size |
| 128.705 |
0.50 mm |
| 128.706 |
0.60 mm |
| 128.707 |
0.70 mm |
| 128.708 |
0.80 mm |
| 128.709 |
0.90 mm |
| 128.710 |
1.00 mm |
| 128.711 |
1.10 mm |
| 128.712 |
1.20 mm |
| 128.713 |
1.30 mm |
| 128.714 |
1.40 mm |
| 128.715 |
1.50 mm |
| 128.716 |
1.60 mm |
| 128.717 |
1.70 mm |
| 128.718 |
1.80 mm |
| 128.719 |
1.90 mm |
| 128.720 |
2.00 mm |
| 128.721 |
2.10 mm |
| 128.722 |
2.20 mm |
| 128.723 |
2.30 mm |
Notes
- Use appropriate speeds and lubrication when drilling harder alloys to maximize tool life.
- Because cobalt steel is harder and more brittle than HSS, apply steady pressure and avoid excessive side loading.
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