Product information L28.3"~ 36.2"(72cm-92cm) Expertise in producing Fitness products more than 20 years. Some sport products are designated as training products especially for National Professional Institutes. 💪【Customer Satisfaction is Our First Priority】If you are unsatisfied in any way with this product, we will refund your money or give you a replacement, no question asked. Kindly remind that please measure the size of your own door frame before purchase! 💪【NO Trace On Your Door】Passing the patent application unique rhombus structure guarantees your security. Soft anti-skid PVC mats on both side to protect the frame from cracking and prevent the damage caused by sudden falling off. The more weight the doorway chin up bars withstand, the more sturdy it is. 💪【NO Screws & NO Drilling】You only take minutes to set it up and remove it on the door frame. Just rotate the pole to press against the door frame. Pay attention to DO NOT use the pull up bar doorway on glass door, hollowed door or other fragile door frame. 💪【Sturdy Locking Mechanism】Made of stainless steel, will prevent the pull up bar from rotating during use, which make sure the security for yourself. Never worry over-tighten the pull-up bar and do BAD damage to your door frame. 💪【Adjustable Pull Up Bars】Customize length for an easy fit in most door frame between 28.3"- 36.2"(72cm-92cm). Suitable for standard doorway, perfect for home, garage or office use. Max. Support: 200kg/440lbs.