These are "Gorilla Ladder 4 in 1 Static Hinges Kit with Storage Case" Preowned. There are no paper instructions with this set, but I do know that they are to be used for scaffolding.
From the Manufacturer
Patented static hinges for use with Gorilla Ladders Aluminum Multi-position ladders in the scaffold position. These hinges feature heavy-duty steel construction and provide extra stability for your Gorilla Ladders scaffold base.
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