Abstract: This invention relates to an improvement for adjustable thresholds. The invention includes a threshold base having a channel extending through the length of the base. Sitting in the channel of the base is an elongated bar having an inverted U-shape cross-section. Throughout the length of the bar are several holes extending through the base of the U-shaped section. Several of these holes are threaded and a bolt is screwed into the threaded hole with the head of the bolt sitting on the bottom of the channel in the base. Screwing the bolt into and out of the threaded hole in the bar will raise and lower the bar, and once the height of the bar has been adjusted, it is fixed in the base of the threshold by a screw extending through holes in the bottom of the inverted U-shaped bar and screwed into threaded holes in the bottom of the channel of the base.