Two clamps per package • Hold round objects up to15”(381mm) in diameter. • Holds tools and equipment measuring up to 30” (762mm) in linear distance. • Each clamp set supports a safe working load of 150lbs (68kilos), with a break-strength of 300lbs(176kilos). • Each base of the clamp mounts with four #10 screws or bolts (not included) Made in the USA