A preferably radiopaque plastic cap is provided which is sized and shaped to facilitate placement over the cut end of a K-wire, orthopedic nail, or similar shaped device, and for frictional engagement on the device. The plastic cap completely covers the non-passivated portion of the cut metal, thereby eliminating or substantially reducing the potential for negative reaction by the surrounding tissue. Moreover, there is reduced pain to the patient when flexing muscles surrounding the ends of the fasteners, and the skin can slide over the cap without irritation or inflammation.