•Material:High quality carbon steel •Working load limit(WLL): 1.0-10t •The clamp is fixed on spiral steel pipe to provide a quick and versatile rigging point for hoisting equipment, like pulley blocks •Lock the spindle counter-clockwise and loosen the clamp opening. Clamp the inferior border of I-steel as the picture. Lock the spindle clockwise to clamp tightly •The shackle is in whole design with the body •Overload is forbidden