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Hole-Making-Drilling-Head-Exchangeable Drills- Drill Body-Qd130-139-16-5xd-Ca. Exchangeable Drill Heads: 6 styles of carbide drill heads available for steel and cast iron applications. Internal Coolant Channels: Highly polished bodies with internal coolant holes for smooth chip evacuation. Multiple L/D Ratios: Available in 1.5xD, 3xD, 5xD, 8xD, and 12xD ratios for various drilling depths. Wide Shank Diameter Range: Shank diameters available from 12mm to 32mm to fit different machine requirements. Stock Availability: Fast delivery available directly from stock for immediate needs. Customized Drilling Diameter: Drilling diameter options range from 8mm to 26mm based on specific models.