Heavy-duty jack chain can be used for a variety of indoor gardening applications. Unique design allows for individual links to be easily opened with pliers. Great for hanging reflectors, light fixtures, carbon filters and ventilation equipment. Zinc coated steel. 100 ft roll weight: 8.5lbs. Trade size: 12. 200 ft roll weight: 17lbs. Working load: 29 lbs. Breaking load: 115 lbs.