Used to make a conical hole for a lathe center in order to make a starting point for a standard twist drill
Precision import Double-ended Each drill has a double end and is ground with a standard 60-degree angle
Used for producing center holds in components or workpieces with require machining between centers.
| size | body diameter(mm) | drill tip diameter(mm) |
|---|---|---|
| # 1 | 3 | 1 |
| # 2 | 5 | 2 |
| # 3 | 8 | 3 |
| # 4 | 12 | 5 |
download the specification for 1.4117 Stainless Steel of ZEICIN
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