Transform your doorway into pull up bar. No screws no assembly. CrossGrips are a pair of handles designed to turn any doorway into a pull-up bar. Our innovative design is durable travel-friendly and gives you the freedom to do pull-ups push-ups or sit-ups anywhere. It requires no assembly and is ready to use in 15 seconds. The patent-pending Smart Clamp System locks to almost any door frame. The compact and innovative grips are made of high-strength polymer that can support up to 250 lbs. Weighing just 1.9 lbs. Per handle its easy to store at home or stow away in a suitcase. The grips interlock for travel or storage and weigh just 1.9 lbs. each. CrossGrips fits door frames that have a top door molding that is 2 to 4 inches tall and inside door frame that is 4.5 to 7.5 inches wide.