Before purchasing, please make sure that the size of your door frame is 29.5 in-37 in (75 cm-94 cm). This Chin up Bar is not suitable for door frame widths outside this range; The width of the door frame must be wider Before purchasing, please make sure that the size of your door frame is 29.5 in-37 in (75 cm-94 cm). This Chin up Bar is not suitable for door frame widths outside this range; The width of the door frame must be wider than the width of the anti-slip pads at both ends of the pull up bar To ensure safety, the manual specifies a maximum load of 297 lbs (135 kg). Testing shows the product can handle up to 744 lbs (337.5 kg) of instantaneous load, meeting a 2.5x safety factor. However, the pull up bar's capacity also depends on the usage environment. Users should strictly adhere to the 135 kg limit No Drilling, No Traces: The pull-up bar uses innovative fixative technology to stay in place. It features two large 6.5 x 1.8-inch PVC mats for added friction and stability. Four metal fixed points connect the base and bar, ensuring a secure, fall-proof design even under heavy loads Heavy Duty Construction: Our Pull Up Bar supports up to 440 lbs (200 kg) with its 2 mm outer and 1.5 mm inner steel pipes. This pull-up bar built to last without deforming or breaking, ensuring durability for your home gym. Note: Longer use distances may reduce the load of chin-up bar Upgraded Mechanic Lock System: This push-up bar features a new 360-degree rotatable dual gear lock on both ends to protect the bar from loosening. The doorway exercise bar has passed extensive testing, ensuring safety and sturdiness for confident use