The 2 hole - pivot joint is an external fastening method that is lightweight yet sturdy. This connector can either mount to the end of a profile, which would require an end tap, or the slot tabs can be removed for mounting directly to the T-slot without any required machining services. The screws on the arms can be adjusted for movement or fixed in one position. The suggested hardware for the 2 hole - pivot joint can be found on the "Suggested Hardware" tab.
For technical details and images, please search for the product using the 80/20 interactive catalogue found here: https://catalogs.8020.net/80-20-Catalog-26/C/.