- Busch carbide twist drills have a robust 2-blade construction and generously sized chip channels. - Made of super hard fine grain carbide these drills are designed to work both on the harder metals associated with carbide tools and on white gold as well. - Numerous perfect drill holes can be replicated with the same tool when using a coolant such as our Lube-Stik (816-2460). - Head length: 10.0 mm. - Figure: 4203S. **For further product information, please contact Chat Support**