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Bucking bars are used by placing the smooth end surface of the bar up against the “bucktail” or end of a rivet fastener. a pneumatic riveting tool is used to apply pressure through multiple hits on the head of the rivet, while the bucking bar is forced (by hand) against the rivet bucktail portion which in turn “smashes” or “sets” the rivet in place, filling the drilled hole it was placed in and securing the fastener in place and making the components rigidly connected.