Chain drill

Chain drill

An attachment to be used with a carpenter’s brace when drilling in metal. It allowed pressure to be exerted on the bit without having to press on the brace. This was done with the help of a chain running from the brace to around the work to be drilled.
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References in periodicals archive ?
Rice suggests that companies run supply chain drills that simulate what would happen if a portion of the chain were compromised.
Shoppers swarmed to B&Q garden centres in their thousands yesterday as the DIY chain drilled a hole in Easter trading laws.