The 5 hole - recessed triangular pivot plate is an external connection method that is intended to be used in pairs to create a custom angle between profiles. The recess replaces the need for a nub in a pivot assembly. This fastening option provides a long-lasting connection and requires no machining services. It can be easily assembled, lending itself to repositioning and reuse. The suggested mounting hardware for the 5 hole - triangular pivot plate with recess can be found on the "Suggested Hardware" tab. Helpful Hint: Use double slide-in economy T-nut bolt assemblies to save time and money. Tip: Pre-load your hardware prior to connecting profiles to simplify your assembly and save time.