These Busch 4203 carbide twist drills feature a 4-groove design optimized for cutting softer organic materials such as coral and pearls. Mounted on 3/32" shanks, this kit provides ten drills ranging from 0.70mm to 1.60mm, offering a complete size progression for fine drilling work. The 4-groove geometry delivers outstanding service life when used correctly and within recommended operating parameters.
For best results and longest tool life, use these drills in a drill press. As with any drill, breakage can occur from excess leverage or canting. When drilling freehand, operate at 5,000–9,000 RPM; a starting guide hole is strongly recommended for freehand use. In a drill press, the recommended speed range is 8,000–14,000 RPM.
Not for use with glass, ceramics, or gemstones.
| Series | Busch 4203 |
|---|---|
| Groove Type | 4-groove |
| Material | Carbide |
| Shank Size | 3/32" |
| Size Range | 0.70mm – 1.60mm |
| Recommended Materials | Coral, pearls, and other soft organic materials |
| Not Recommended For | Glass, ceramics, gemstones |
| Freehand Speed | 5,000–9,000 RPM |
| Drill Press Speed | 8,000–14,000 RPM |
| Kit Quantity | 10 drills |
California Prop 65 Warning:No reviews yet. Be the first to share your experience with this product.
Write a review ↓