Description
The 4 groove design of these special Busch 4203 3/32″ mounted carbide twist drills works best with softer materials, so these carbide drills are recommended for cutting coral and pearls. These drills will last the longest when used in a drill press, as like any drill, breakage will occur with excess leverage or canting. If using by free-hand, the recommended speed is 5,000 to 9000 rpm, and the use of a starting guide hole will help. For use in a press, the recommended speed is from 8,000 to 14,000 rpm. Not for use with glass, ceramics and gem stones. These Carbide twist drills are sold by the piece.
4 Groove-Recommended for softer materials like Coral and Pearls-Outstanding Service Life
Choose from 10 sizes:
- B128.707 0.70mm
- B128.708 0.80mm
- B128.709 0.90mm
- B128.710 1.00mm
- B128.711 1.10mm
- B128.712 1.20mm
- B128.713 1.30mm
- B128.714 1.40mm
- B128.715 1.50mm
- B128.716 1.60mm
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