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55° Solid Tungsten Carbide Drill Bits, Ultra-Hard Imported Straight Shank Twist Drills for Steel, 1-3mm, Find Details and Price about Tungsten Carbide Drill Bits Solid Twist Drill from 55° Solid Tungsten Carbide Drill Bits, Ultra-Hard Imported Straight Shank Twist Drills for Steel, 1-3mm - Dongguan Unixin Precision Tool Co., Ltd.