P90X Chin-up Bar and Chin-up Max Combo P90X Chin-Up Bar helps build a strong V-shaped back and muscular arms P90X Chin-Up Bar supports up to 300 pounds; fits doorways up to 32 inches wide Chin-up Max offsets some of the weight your muscles must support doing pull-ups and chin-ups Chin-up Max is adjustable for optimal amount of resistance Chin-up Max is designed for use with the P90X Chin-up Bar