Upgraded Security - Eject Protection The two ends of this Rhinosport pull up bar are our original design of the spring automatic extrusion setting. When the gravity presses down, the upper and lower springs automatically squeeze against the wall to achieve a non-slip protection effect. Firmly Locked Upgraded triple gear lock design, locking and anti-rotation design to prevent the lever from loosening and rotating. The thickened stainless steel tube prevents the lever from turning during use, ensuring your safety. NO Marks Left On Doors & High-precision spirit level Capacity Up To 200kg/440lb. Our pull up bar doorway' installation is not tilted, easy to install and effortless, you don't even need a screwdriver and fits most door frames, and can be assembled and disassembled in seconds.