Camco RV Clamp-N-Carry Chair and Bike Rack is designed to securely hold four or more chairs depending on chair style on most standard 1" and 7/8" diameter ladders (adapters included). This unit can hold a capacity of 50lb per arm. It is constructed with glass-filled nylon with UV inhibitors and zinc-plated hardware. It is lockable and won't rust or corrode and includes adjustable straps to stabilize chairs while traveling. For your convenience the arm swings out of the way quickly for ladder access.