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A semi-trailer lock, the J Series locks onto the kingpin on a dropped semi-trailer to prevent hookup. The lock is automatically secured when pushed onto the kingpin and the key can be withdrawn only in the locked position. Its bright red finish signals drivers not to back into lock. The deadlocking bolt functions feature a deadlocking bolt controlled by key to prevent bolt from being shimmed or jimmied. A key is necessary both to secure and remove deadlocking bolt models.