QUICK FIST SUPER holds objects 2 1/2″ to 9 1/2″ (64mm to 240mm) in diameter. Mounts easily. Each clamp supports a safe working of 50lbs. (23kilos). Ideal for air tanks, Fire extinguishers, scuba tanks, hose nozzles, etc. (packed one clamp per package). QUICK FIST Clamps are made in the USA of heavy duty transportation grade rubber and are not affected by hot or cold climates or salt. The rubber is also UV resistant.