1 - UPDATED WIDTH ADJUSTABLE DOORWAY PULL UP BAR:Real adjustable width design can match your doorway more accurately, even doors in the corner. This door frame pull-up bar has 5 levels of adjustment for width and 2 levels of adjustment for thickness can be precisely mounted on any standard 21.65 "- 39.37" wide doorways,depth of 4.7"-8.27",Acceptable trim height up to 3.75"easy to install and remove. Design does not necessitate screwing into frame making the assembly easy to remove. 2 - HEAVY DUTY CONSTRUCTIONHOLD UP TO 500 LBS: The pullup bar make from 1.7mm thickened chrome steel.Original no break in the middle , double steel pipe superposition construction.These features permit the 500lb weight limit.High quality lock nuts help prevent loosening of the assembly.The fine powder coating prevent rust and corrosion.High fiber foam handles provide a comfortable grip, anti-slip and wear resistance. 3 - UPDATED DOUBLE SILICONE PROTECTION FOR DOOR FRAME:Updated the traditional foam that contacts the door frame to elastic silicone.Permanent use,can never be broken,better fits and protects door frame.Also,the chin up bar includes two 4mm thick No-Trace removable silicone pads to further protect the door frame.Why do we add protective pads?Because when we do exercise there is an upward and downward force of friction.So double silicone protection(double insurance)for your door frame is the best way. 4 - MULTI-FUNCTION HOME GYM:Target multiple upper body & core muscles with pull-ups, push-ups, dips, and hanging crunches.These multiple functions make working out quicker and more efficient.With this pull up bar, home and office become your gym. 5 - SECURE & SAFE: Simple and easy to install or uninstall and store when there is limited space. Heavy-duty chrome steel doorway pulls up bar and door mounts provide great support and safety. Before using the upper body workout bar tug down on the grips to make sure the unit is securely installed into door frame.