15.6mm 15.7mm 15.8mm 15.9mm 16mm HSS Reduced Straight Crank Twist Drill Bit Shank Dia 12.7mm 1/2 inch 15.6 15.7 15.8 15.9 16

15.6mm 15.7mm 15.8mm 15.9mm 16mm HSS Reduced Straight Crank Twist Drill Bit Shank Dia 12.7mm 1/2 inch 15.6 15.7 15.8 15.9 16

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