Midwest Tungsten Service high density ergonomic tungsten bucking bar rivet blocks reduce vibration and kickback while riveting in aircraft operations. Repeated vibrations can cause wrist strain and fatigue, and regular steel bucking bars don't fully protect the riveter from the harmful effects. Tungsten, over twice as dense as normal steel, absorbs the shock, allowing you to rivet more effectively for a longer period of time. If you don't find a size below that fits your riveting needs, custom bars can be made to your specifications.