Any accessories - acid shield, locking devices, chain operation, etc.
防酸保护层，锁定装置，链条操作，等等。
When using the swivel chain between two cars, again through the bolt will turn on both ends of the chain (meet) the pin hole up and down together, and then the bolt locking.
使用时将转环链放于两车之间，再通过插销将转环链两端（碰头座）的上下销孔连接在一起而后将插销锁紧即可。
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