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For general purpose drilling in both metal and wood, these drill bits have a phosphor black finish, reduced shanks and an overall length of 165mm (6½in). For use in bench and power drills equipped with 13mm chucks and variable speed which avoids overheating. It is always best to use a cutting lubricant when drilling metal. Bit Diameter. 9/16in Overall Length. 6.1/2in.
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