27.5mm 28mm 28.5mm 29mm HSS Reduced Straight Crank Twist Drill Bit Shank Dia 12.7mm 1/2 inch 27.5 28 28.5 29

27.5mm 28mm 28.5mm 29mm HSS Reduced Straight Crank Twist Drill Bit Shank Dia 12.7mm 1/2 inch 27.5 28 28.5 29

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