a portable hand tool for crimping ferrules on flexible conduits such as are used for electrical wiring , for example . two members pivotally connected to each other have handle portions for manipulation by the user , and jaw portions . one jaw portion has a fixture pivotally mounted on it , for receiving a ferrule which has been placed on but not yet crimped to the end of a conduit . the other jaw portion has laterally spaced arms which straddle the conduit and , as the jaws move toward each other , exert pressure on the usual nut which serves also as a crimping member , to force the internal crimping flange of the nut axially against the rear end of the ferrule to deform the metal of the ferrule and crimp it firmly onto the conduit .