<https://brightlots.com/product/quadruple-square-horizontal-tenon/>
<http://schema.org/description>
"PB-HTX4 series quadruple square horizontal tenons for 4” and 5” square steel poles. X=4 for 4 inch and X=5 for 5 inch square poles."
<https://brightlots.com/product/quadruple-square-horizontal-tenon/>