Lead catchers are used to stop bits of wire and component leads from flying off during cutting. This allows uninterrupted work while preventing pieces from damaging other components. Plier springs ensure the plier returns and does not remain caught on the component. They will return the plier to the ready position as well as assist in cutting. Pneumatic cutter parts use compressed air in heavy-duty cutting applications. They feature a sharper blade and can be used on metal.