Threaded metal hook. Does anybody know what this is meant to

Threaded J Hook - Innomod Projects

What is this thing? about waist high, goes up and down, has a sort of lock screw in the middle to keep the bar sturdy. : r/whatisthisthing

Threaded Gaff Hook- Max-Gain Systems, Inc.

Threaded metal hook. Does anybody know what this is meant to attach to? : r/whatisthisthing

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