卸扣是吊装施工作业中不可缺少的索具配件。卸扣可用于连接起重滑轮和固定吊索。是一种用途广泛的轻便灵活的连接工具。枷锁按外观特点可分为弓形卸扣和U型卸扣。按用途分有：链条式卸扣、锚式卸扣、浮式卸扣。
(1) 链条枷锁 is a 枷锁 used to connect the anchor chain. When in use, the horizontal bolt should be upward, and the horizontal bolt should be round to prevent it from rotating in the bolt hole and increase its strength. When using, first take out the horizontal bolt of the 枷锁, put the U-shaped buckle into the anchor chain ring to be connected, and then connect the horizontal bolt in series to an anchor chain ring above. In order to prevent the horizontal bolt from coming out, there is an oblique hole at each of the two ends of the horizontal bolt and the U-shaped buckle for driving the brake oblique pin. In order to prevent the oblique pin from coming out, a green lead seal should be inserted into the cavity left at the pin hole. Before the oblique pin is inserted into the pin hole, calcium-based grease should be applied to prevent rust.
(2) 锚 枷锁 is the 枷锁 used to connect the anchor chain and the sinker, and the method of use is the same as the chain 枷锁.
(3) The floating 枷锁 is the 枷锁 used to connect the floating body and the anchor chain, and the method of use is the same as the chain 枷锁.