This chin-up bar is designed with two anti-slip devices using high quality silicone pads on both sides, which can firmly adhere to the wall. Keep your doors and walls intact. The wedge design gives you strong support and security. The wedge is the surface on which downward gravity is broken down into two transverse pulls. The harder you pull on this bar, the more stable this pull up bar is. The door pull-up bar has a locking mechanism that prevents the bar from loosening and rotating. Once the lock is installed, there will be no more sliding. The portable chin-up bar can be easily mounted at different heights and locations for each workout. Convenient disassembly allows setup within 30 seconds, letting you enjoy your exercise anytime. You can use this bar for a variety of exercises, including chin-ups, pull-ups, hanging leg raises, sit-ups, crunches and other exercises. This multifunctional smart bar is a must have for home fitness equipment.