I need to confirm the "U" measurement opening. It will be used to hang a pole and need to make sure it will fit. (Sugatsune 304 Stainless Steel 2-3/16" (56mm) Utility Hook (Satin Stainless))

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I need to confirm the "U" measurement opening. It will be used to hang a pole and need to make sure it will fit. Sugatsune 304 Stainless Steel 2-3/16" (56mm) Utility Hook (Satin Stainless)