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Terms of Payment: T/T Packaging: In plastic boxes Delivery Lead Time: About 30 days Detailed Product Description We can also produce micro-boring bar with coolant hole, high speed steel shank and carbide shank. Tips: 1. High relief of angle will bring small flank wear. 2. High relief of angle will weaken the cutting edge. 3. Low relief angle may cause chattering. How to select: 1. For hard workpiece 2. For the applications that need strong cutting edge Then choose low relief angle 1. For soft workpiece 2. For the workpiece having property to get work hardening Then choose high relief angle tool holder, cutting tools, cnc tool