US tariffs on steel and aluminum doubled to 50% as of 12:01 am ET on Wednesday, a move cheered by the beleaguered US steel industry but decried by heavy users of the metals, from car makers to can manufacturers.

President Trump doubled almost all aluminum and steel import tariffs, seeking to curb China’s growing dominance in global trade. These six charts show the tariffs’ potential economic effects.

U.S. steelmaker shares soared on news of President Trump’s new tariffs. But are these tariffs as bulletproof as investors seem to believe? The steel tariffs, like those on autos and auto parts, are sector-based.