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5 Blades 4145h Steel PDC Oil Drill Bit 17-1/2" 444.5mm High Wear. Ultra-High Wear Resistance: Diamond layer 2.0-3.0mm thick offers 2.5x higher wear resistance than industry standard. Impact-Resistant Steel Body: High-strength alloy steel with arc transition increases impact toughness by 30%. Fast Delivery: Standard and customized models delivered within 15 days. Versatile Applications: Suitable for oil & gas, geothermal, coal bed methane, hard rock mining, and water wells. Cost-Effective Design: Steel body construction offers lower cost compared to matrix body PDC bits.