Questions? Leave a comment below! 1. No Screws & No Drilling & No Assemble & Non-Slip. Not like other Traditional pull-up bar, the bar allows you to perform your exercise at anywhere of the hallway at any height, not need to assemble, screws not required. Both ends of the doorway pull up bar adapt to patented anti-slip devices and honeycomb pads, can firmly stick on your door frame or wall, Inside there is three-spots to support whole structure 2.Adjustable Pull Up Bar. Customize length for an easy fit in most door frame between 28.3"- 36.2". Suitable for any cement walls, security doors, solid wood doors, corridors. Turn any door into personal gym. With this pull up bar wall mounted, let home and office become your gym and do any exercise like pull-ups, push-ups, chin-ups, dips, crunches, and more 3. Non-slipping Grip Handles & Sturdy Locking. Patented Adjustable Width security lock, Buckle design 360°lock make sure that the door pull up bar doesn't loosen during training. The thick foam hand grip provides extra comfort and minimizes hand fatigue or pain. The unfixed designed grips allow you to move it to a suitable position for you exercise