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A round, tapered metal rod that is driven into matching rivet holes of two metal parts for stretching the parts and bringing them into alignment.
1. A square or round metal rod with no threads, driven into an undersized, pre-bored hole as a substitute for a bolt, screw, or other fastener.
2. A short, tapered rod for enlarging rivet holes or bringing them into line; also called a drift.
3. A driftbolt.
4. A tapered round rod used to align holes in two or more pieces of metal.