NO Screws & NO Drilling& NO Trace Only take minutes to set it up and remove it on the door frame. This pull up bar is designed with two anti-skid devices on both sides, Just rotate the pole to press against the door frame, which can firmly stick on the wall. The harder you pull this bar, the more stable this pull up bar is. Sturdy locking mechanism Higher security Patented security lock, 360 lock Make sure that the bar doesn't loosen during swing. Larger and thicker silicone pad than market, So have higher slip resistance ensures stability. Versatile uses, Quick set-up No screws installation allows you to adjust the height and place at any time.