Persian drill
{{Short description|Hand-operated drill}}
A Persian drill is a drill which is turned by pushing a nut back and forth along a spirally grooved drill holder.{{cite book |title=Five hundred and seven mechanical movements |last=Brown |first=Henry T. |page=33 |year=1868 |publisher=Brown & Seward |oclc=6821027 }} It was formerly used for delicate operations such as jewellery making and dentistry.{{cite book |title=The Art of Fine Tools |last=Nagyszalanczy |first=Sandor |page=84 |year=2000 |publisher=Taunton Press |isbn=978-1-56158-361-4 }} A ratcheting screwdriver with a "spiral ratchet" mechanism may be used as a Persian drill.