The 20 hole - cross flat plate is an external fastening method that can be used to join more than two profiles or even create a 4-way connection hub. It provides a strong, long-lasting connection that is easy to assemble and requires no machining services. The 20 hole - cross flat plate is durable and can be repositioned and reused. The suggested mounting hardware can be found on the "Suggested Hardware" tab. Tip: Use double or triple slide-in economy T-nuts to save time and money. Pre-load your hardware prior to connecting profiles to simplify your assembly.