Explosion -proof hand stubborn 2 tons of 3 meters is a single -strand or dual chain. The specification of the 2 -ton of the handle is a single chain and a dual chain. The volume of a single -chain gourd head is larger than the dual chain. It is made with a 3 -ton gourd head. Because of the problem of structure and bearing. Single -chain or dual chain should be based on customer's use requirements and habits. The upper and lower hooks of the hand -pour gourd have insurance cards to prevent heavy objects from falling off and prevent the gourd from falling off from a fixed point.