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 insert tabs can be removed for mounting directly to the T-slot without any required machining services. The insert tabs include both an M8 and M10 size. 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.