This product is easy to use. This product is highly durable This product is manufactured in China 18 long, 1/2 diameter, .370 shank Hole in flute
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Irwin 39108 1/2-Inch by 18-Inch Installer Twist Drill Bit
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Irwin 39108 1/2-Inch by 18-Inch Installer Twist Drill Bit
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Irwin 39108 1/2-Inch by 18-Inch Installer Twist Drill Bit
Irwin 39108 1/2-Inch by 18-Inch Installer Twist Drill Bit