For those owners who live and work in challenging environments. Sub-zero winters, mud caked rockers; AMP Research PowerStep XTreme is designed to hold up to the extreme. Fits 2015-2018 Chevrolet Silverado 2500 HD, 3500 HD, 2015-2018 GMC Sierra 2500 HD, 3500 HD, 2014-2018 Chevrolet Silverado 1500,2014-2018 GMC Sierra 1500
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